Materials Today Physics最新文献_第6页

Creation and manipulation of magnetic skyrmions in 2D van der Waals magnets 二维范德瓦尔斯磁体中磁性 Skyrmions 的生成与操纵

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-14 DOI: 10.1016/j.mtphys.2025.101727

Xueyan Li, Xiyuan Liu, Jiaqi Yang, Yinuo Zhang, Yi Pan

{"title":"Creation and manipulation of magnetic skyrmions in 2D van der Waals magnets","authors":"Xueyan Li, Xiyuan Liu, Jiaqi Yang, Yinuo Zhang, Yi Pan","doi":"10.1016/j.mtphys.2025.101727","DOIUrl":"10.1016/j.mtphys.2025.101727","url":null,"abstract":"<div><div>Magnetic skyrmions are topologically stable swirling spin textures, usually with nanoscale diameters. It has attracted tremendous research interest due to the rich new physics of chiral interactions between the atomic spins, as well as the intriguing potential application in non-volatile data storage and spin-logic devices. In recent years, the skyrmion physics and materials have been enriched significantly due to the rise of two-dimensional (2D) van der Waals (vdW) magnets. In this paper, we review the recent research advances of magnetic skyrmions in the van der Waals magnetic material systems. Firstly, we classify the physical mechanisms that induce the magnetic skyrmions in 2D materials and their heterostructures. Then, we discuss the specific properties of three representative material systems, Fe<sub>3</sub>GeTe<sub>2</sub>, Fe<sub>3</sub>GaTe<sub>2</sub>, and CrTe<sub>x</sub>. In the third section, we introduce the theoretical strategy and experimental method for skyrmion manipulation in 2D-magnet-based devices. Finally, we summarize the main progress, as well as the challenges and perspectives of future research, particularly the scanning-probe-assisted in situ device investigation method.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101727"},"PeriodicalIF":10.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic thermoelectric generation enables 50% increase of efficiency at maximum power 动态热电发电使效率提高50%，在最大功率

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-12 DOI: 10.1016/j.mtphys.2025.101713

Dario Narducci, Federico Giulio, Antonio Mazzacua

{"title":"Dynamic thermoelectric generation enables 50% increase of efficiency at maximum power","authors":"Dario Narducci, Federico Giulio, Antonio Mazzacua","doi":"10.1016/j.mtphys.2025.101713","DOIUrl":"10.1016/j.mtphys.2025.101713","url":null,"abstract":"<div><div>Thermoelectric generators are devices capable to convert heat into electric power with no moving part. However, and despite a tremendous research effort on materials, their conversion efficiency is still limited, especially in the low temperature range where most of the discarded heat is available. We show that the exact solution of the time-dependent Domenicali’s equation predicts that, when the temperature difference across the thermoelectric legs is modulated in time, efficiency at maximum power (<span><math><msub><mrow><mi>η</mi></mrow><mrow><mtext>MP</mtext></mrow></msub></math></span>) improves by up to 50% compared to the stationary case — with a power output equivalent to that attainable by doubling the material figure of merit. Building on this evidence, we additionally show how, even for sources delivering heat at a constant rate, simple heat flux pre-processing leads to a comparable <span><math><msub><mrow><mi>η</mi></mrow><mrow><mtext>MP</mtext></mrow></msub></math></span> improvement. Since the operational mode we propose is material-agnostic and does not require changes of the device layout, it could find prompt application.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101713"},"PeriodicalIF":10.0,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced thermopower by double-site substitution of Ti in Fe2(VAl)1-xTi2x Fe2(VAl)1-xTi2x中双位取代Ti增强热能

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-11 DOI: 10.1016/j.mtphys.2025.101712

M. Parzer , A. Kositz , J. Süß , F. Garmroudi , T. Mori , E. Bauer

{"title":"Enhanced thermopower by double-site substitution of Ti in Fe2(VAl)1-xTi2x","authors":"M. Parzer , A. Kositz , J. Süß , F. Garmroudi , T. Mori , E. Bauer","doi":"10.1016/j.mtphys.2025.101712","DOIUrl":"10.1016/j.mtphys.2025.101712","url":null,"abstract":"<div><div>Thermoelectric (TE) materials, which directly convert heat into electricity, hold promise for sustainable energy applications. For widespread adoption of this technology, the development of efficient, cost-effective, and non-toxic TE materials is crucial. Here, we attempt to improve the thermoelectric properties of Fe<sub>2</sub>VAl-based full-Heusler compounds through the targeted substitution of (VAl) by Ti<sub>2</sub> in <figure><img></figure> . Our study reveals a miscibility gap between <span><math><mrow><mn>0</mn><mo>.</mo><mn>4</mn><mo><</mo><mi>x</mi><mo><</mo><mn>0</mn><mo>.</mo><mn>9</mn></mrow></math></span>, yet significant enhancement of the thermoelectric performance for both <span><math><mi>p</mi></math></span>- and <span><math><mi>n</mi></math></span>-type compounds was achieved for smaller substitutions. While Fe<sub>2</sub>VAl and Fe<sub>2</sub>Ti<sub>2</sub> are semimetals, a band gap opening occurs in the solid solution series, yielding a substantial enhancement of the Seebeck coefficient up to 130 μV/K in <span><math><mi>p</mi></math></span>-type materials. By additional optimization via isovalent V/Ta heavy-element substitution, we further optimize the TE performance, achieving one of the best <span><math><mrow><mi>z</mi><mi>T</mi></mrow></math></span> values in <span><math><mi>p</mi></math></span>- and <span><math><mi>n</mi></math></span>-type full-Heusler compounds and revealing the (VAl)/Ti<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> substitution as a promising pathway for improving the TE efficiency of full-Heusler compounds.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101712"},"PeriodicalIF":10.0,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel composite film with superhydrophobic graphene for anti-icing/deicing via chemical-assisted magnetically controllable picosecond laser writing 通过化学辅助磁性可控皮秒激光写入技术，研制出一种用于防冰/除冰的新型超疏水石墨烯复合薄膜

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-11 DOI: 10.1016/j.mtphys.2025.101726

Haozhe Chang , Zhen Zhang , Peng Wang , Guojun Zhang

{"title":"A novel composite film with superhydrophobic graphene for anti-icing/deicing via chemical-assisted magnetically controllable picosecond laser writing","authors":"Haozhe Chang , Zhen Zhang , Peng Wang , Guojun Zhang","doi":"10.1016/j.mtphys.2025.101726","DOIUrl":"10.1016/j.mtphys.2025.101726","url":null,"abstract":"<div><div>Icing affects the safe operation of the aircraft and can also damage other outdoor equipment, causing safety hazards. Passive anti-icing of superhydrophobic surface helps to reduce the energy consumption of active thermal deicing. The magnetically controllable direct laser writing (MDLW) was used to fabricate the micro-scale tapered structure and nano-scale layered structure. The superhydrophobic was enhanced by the chemical modification assisted magnetically controllable direct laser writing (C-MDLW), and the graphene capillaries were wrapped to form nanoscale particles. The different material removal mechanisms during the two laser scans, including photochemical mechanism, photothermal mechanism, and ionizing plasma, were described. The differences in surface morphology and chemical elements were analyzed to illustrate their effects on superhydrophobicity. The 'fog' shaped nano graphene capillary structure and high content of polar molecules result in strong hydrophilicity, while the nano particles and non-polar molecules formed after chemical modification are the key reasons for the transformation into superhydrophobicity. The contact angle of C-MDLW was as high as 163.0°, and the roll-off angle was 1.8°. Droplets at different heights can bounce on surfaces with different inclination angles. Compared with the raw surface, the icing time was delayed by about 29.5 times. Combined with the electric heating film with a good Joule heating effect, the surface temperature increased. Because of the long icing time, the electric energy was saved by about 86 % in the icing and deicing period.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101726"},"PeriodicalIF":10.0,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the mechanism of electronic structure and superconductivity of cubic X2BH6 at ambient pressure 常压下立方X2BH6电子结构和超导机理的研究

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-11 DOI: 10.1016/j.mtphys.2025.101725

Ya-Le Tao, Qi-Jun Liu

{"title":"Investigation on the mechanism of electronic structure and superconductivity of cubic X2BH6 at ambient pressure","authors":"Ya-Le Tao, Qi-Jun Liu","doi":"10.1016/j.mtphys.2025.101725","DOIUrl":"10.1016/j.mtphys.2025.101725","url":null,"abstract":"<div><div>The search for high <em>T</em><sub><em>c</em></sub> materials under ambient pressure remains a central objective in materials science. This study investigates doping the BH<sub>6</sub> units (B as the primary transition metal) using Group 2 and Group 3 elements (X) as dopants, focusing on charge transfer between dopants and the BH<sub>6</sub> units and its effects on bonding and superconductivity. Doping modulates the <em>E</em><sub><em>F</em></sub> position and influences electron pairing. Magnesium is unique due to its electride properties under ambient pressure, generating localized anionic electrons in interstitial sites. These electrons facilitate charge transfer between the dopant and BH<sub>6</sub> units, enhancing the DOS at the <em>E</em><sub><em>F</em></sub> from hydrogen, whereas other dopants with <em>d</em>-orbital electrons suppress the contribution of hydrogen. In contrast to high-pressure hydrides, where covalent bonding stabilizes structures and superconductivity, the appearance of positron cluster and ionic bonds within the BH<sub>6</sub> units in the X<sub>2</sub>BH<sub>6</sub> system strongly supports the structure exhibiting significant ionic character and charge redistribution. This ionic nature increases the free electron count, enhancing Cooper pair formation and superconductivity. Particularly in Mg<sub>2</sub>IrH<sub>6</sub>, Mg's localized electrons are readily accepted by hydrogen, boosting the hydrogen-derived DOS at the <em>E</em><sub><em>F</em></sub>. This activates mid-to high-frequency phonon modes, driving large electron-phonon matrix elements and inducing strong electron-phonon coupling, resulting in a high <em>T</em><sub><em>c</em></sub> of 103.4 K under ambient pressure.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101725"},"PeriodicalIF":10.0,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decoding the thermal conductivity of ionic covalent organic frameworks: Optical phonons as key determinants revealed by neuroevolution potential 解码离子共价有机框架的导热性：神经进化潜能揭示的关键决定因素--光学声子

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-09 DOI: 10.1016/j.mtphys.2025.101724

Ke Li, Hao Ma

{"title":"Decoding the thermal conductivity of ionic covalent organic frameworks: Optical phonons as key determinants revealed by neuroevolution potential","authors":"Ke Li, Hao Ma","doi":"10.1016/j.mtphys.2025.101724","DOIUrl":"10.1016/j.mtphys.2025.101724","url":null,"abstract":"<div><div>Ionic covalent organic frameworks (ICOFs) are a unique subclass of covalent organic frameworks (COFs) that combine the advantages of metal-organic frameworks (MOFs) and COFs through the integration of ionic and covalent bonds. Using ICOF-10n-Li/Na as examples, we trained a machine learning-based neuroevolution potential (NEP) function and conducted a comprehensive study of the thermal transport properties of ICOFs through large-scale molecular dynamics simulations. We found that the thermal conductivity perpendicular to the pore channels (x-direction) reaches a maximum of 4.04 ± 0.20 W m<sup>−1</sup> K<sup>−1</sup> at room temperature, primarily driven by high-frequency optical phonons (contributing ∼94 %). In contrast, the thermal conductivity along the pore channels (z-direction) is 0.74 ± 0.02 W m<sup>−1</sup> K<sup>−1</sup>, dominated by low-frequency acoustic phonons (contributing ∼67 %). Further analysis reveals that linker types strongly influence phonon lifetimes of optical phonons in the x-direction, while interlayer ions significantly impact group velocities of acoustic phonons in the z-direction. This work highlights the critical role of optical phonons in determining the thermal behavior of ICOFs and provides deep insights into the influence of linkers and interlayer ions on thermal transport properties. The superior thermal conductivity (4.04 ± 0.20 W m<sup>−1</sup> K<sup>−1</sup>) achieved in the x-direction underscores the unique synergistic effects of ionic and covalent bonding in ICOFs, making them highly promising for applications requiring efficient thermal management and molecular separation.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101724"},"PeriodicalIF":10.0,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deep learning enhanced prediction of microwave dielectric constant of spinel ceramics eliminating manual feature engineering 深度学习增强尖晶石陶瓷微波介电常数预测，消除人工特征工程

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-08 DOI: 10.1016/j.mtphys.2025.101723

Xiaobin Liu , Qiuxia Huang , Chang Su , Ning Shao , Lei Zhang , Yapeng Tian , Huanfu Zhou

{"title":"Deep learning enhanced prediction of microwave dielectric constant of spinel ceramics eliminating manual feature engineering","authors":"Xiaobin Liu , Qiuxia Huang , Chang Su , Ning Shao , Lei Zhang , Yapeng Tian , Huanfu Zhou","doi":"10.1016/j.mtphys.2025.101723","DOIUrl":"10.1016/j.mtphys.2025.101723","url":null,"abstract":"<div><div>Machine learning (ML) has demonstrated considerable promise and superiority in the prediction of microwave dielectric ceramic (MWDC) properties. Nonetheless, applying traditional ML models often requires processing numerous features, making their implementation complex and unwieldy. In this work, a deep learning (DL) model named CRANCNN-M2V that predicts the dielectric constant of spinel-MWDCs eliminating manual feature engineering has been constructed. The model can identify essential features directly from chemical compositions using the data embedding method. Our model further improved the network based on a Compositionally Restricted Attention-based Neural Network (CrabNet) and showed the enhanced prediction performance in the dielectric constant of spinel-MWDCs, achieving an RMSE of 1.52, an MAE of 0.938, and an R<sup>2</sup> of 0.954, and it also outperformed commonly used traditional ML models (e.g., XGBoost, Random Forest (RF), Decision Tree (DT), etc.). Furthermore, the contribution of different elements in the dielectric constant of spinel MWDCs has been analyzed via our CRANCNN-M2V model. Highly accurate and efficient prediction of our model will effectively promote the design and development of spinel-MWDCs applied for wireless communication.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101723"},"PeriodicalIF":10.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phonon softening and significant thermal conductivity drop induced by tailoring interlayer interactions in Nb-doped rhombohedral MoS2 铌掺杂菱形二硫化钼的层间相互作用诱导声子软化和显著的导热系数下降

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-08 DOI: 10.1016/j.mtphys.2025.101722

Zhen Yang , Keke Liu , Shuo Chen , Shenlong Zhong , Jinsong Wu , Xianli Su , Ctirad Uher , Qingjie Zhang , Xinfeng Tang

{"title":"Phonon softening and significant thermal conductivity drop induced by tailoring interlayer interactions in Nb-doped rhombohedral MoS2","authors":"Zhen Yang , Keke Liu , Shuo Chen , Shenlong Zhong , Jinsong Wu , Xianli Su , Ctirad Uher , Qingjie Zhang , Xinfeng Tang","doi":"10.1016/j.mtphys.2025.101722","DOIUrl":"10.1016/j.mtphys.2025.101722","url":null,"abstract":"<div><div>The differences in stacking configurations result in rhombohedral transition metal dichalcogenides (3R-TMDs), compared to their hexagonal counterparts, exhibiting stronger interlayer interactions, sliding ferroelectricity, and bulk piezophotovoltaic effects. However, the effects of doping on interlayer interactions and phonon transport in 3R-TMDs have not been fully explored. In this study, we demonstrate Nb doping in 3R-MoS<sub>2</sub> effectively modulates interlayer interactions and causes a significant decrease in thermal conductivity. The increased carrier concentration induced by doping enhances screening, leading to the softening and deceleration of optical phonons. Additionally, doping modulates the interlayer interactions, causing changes in the phonon vibrational modes. This results in an avoided crossing between optical and acoustic phonons, further reducing the group velocity of acoustic phonons. Combined with the reduction in phonon mean free path due to point defect scattering, this ultimately leads to a 56 % decrease in the lattice thermal conductivity of 3R-MoS<sub>2</sub>. This study deepens our understanding of the relationship between phonon dispersion and interlayer interactions in 3R-TMDs, providing valuable insights for the design of thermal management materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101722"},"PeriodicalIF":10.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced thermal conductivity and electrical insulation properties of liquid crystalline epoxy composites by using optimized alumina hybrid fillers 采用优化的氧化铝杂化填料提高液晶环氧复合材料的导热性能和绝缘性能

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-07 DOI: 10.1016/j.mtphys.2025.101719

Yuanhang Zhou, Xiangyu Tian, Xiaolong Cao, Qiong Wang, Jinkai Wang, Yingge Xu, Meng Luo, Zhengdong Wang

{"title":"Enhanced thermal conductivity and electrical insulation properties of liquid crystalline epoxy composites by using optimized alumina hybrid fillers","authors":"Yuanhang Zhou, Xiangyu Tian, Xiaolong Cao, Qiong Wang, Jinkai Wang, Yingge Xu, Meng Luo, Zhengdong Wang","doi":"10.1016/j.mtphys.2025.101719","DOIUrl":"10.1016/j.mtphys.2025.101719","url":null,"abstract":"<div><div>In order to satisfy the increasing demand for packaging materials of power devices, a contradiction between thermal conductivity and breakdown strength urgently needs to be addressed. In this work, we reported a novel liquid crystalline epoxy composites with a hybrid filler of nano-diamond and modified alumina (AO∗@ND) by self-assembly polymerization of cationic monomer, electrostatic adsorption and a calcination technique. The thermal conductivity and dielectric breakdown strength of the composite with biphenyl liquid crystalline epoxy and 10 wt% AO∗@ND (500 °C-6 h) were 0.99 W/m·K and 75.2 kV/mm, respectively, which achieve a remarkably synergistic enhancement compared to those (0.2 W/m·K, 69.64 kV/mm) of the commercial bisphenol A epoxy for packaging materials of power devices. The mechanism for the simultaneous increase was indicated by the simulation calculations and experimental results. This research could provide a novel insight for the development of high-performance epoxy composite materials for the encapsulation of new-generation power devices.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101719"},"PeriodicalIF":10.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143789676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering short-segmented columnar defects in seconds for 20 MA/cm2 supercurrent density in iron-based superconductors 铁基超导体中20 MA/cm2超电流密度的工程短节柱状缺陷

IF 1 2区材料科学

Materials Today Physics Pub Date : 2025-04-04 DOI: 10.1016/j.mtphys.2025.101718

Junsong Liao , Chiheng Dong , Ningning Liu , Dongliang Gong , Xianping Zhang , Dongliang Wang , Yanwei Ma

{"title":"Engineering short-segmented columnar defects in seconds for 20 MA/cm2 supercurrent density in iron-based superconductors","authors":"Junsong Liao , Chiheng Dong , Ningning Liu , Dongliang Gong , Xianping Zhang , Dongliang Wang , Yanwei Ma","doi":"10.1016/j.mtphys.2025.101718","DOIUrl":"10.1016/j.mtphys.2025.101718","url":null,"abstract":"<div><div>Realizing ultra-high supercurrent density in iron-based superconductors (IBS) is a crucial step toward practical applications at high magnetic fields. However, engineering the most effective pinning structure to maximize the critical current density (<em>J</em><sub>c</sub>) remains an open challenge. In this work, Ba<sub>1-x</sub>K<sub>x</sub>Fe<sub>2</sub>As<sub>2</sub> single crystals were irradiated by Xe ions within seconds, achieving a high <em>J</em><sub>c</sub> of 20 MA/cm<sup>2</sup> at 2 K. Remarkably, the <em>J</em><sub>c</sub> remains 8.7 MA/cm<sup>2</sup> at 5 K and 4 T, which surpasses previously reported values of IBS at high-fields. This enhancement is attributed to the replacement of intrinsic weak collective pinning by strong pinning of segmented discontinuous columnar defects. The advantageous pinning landscape minimizes superconductivity degradation and efficiently suppresses the motion of vortex kinks across a wide temperature range. The <em>J</em><sub>c</sub> (25 K, 5 T) is enhanced to 1.2 MA/cm<sup>2</sup>, which is nearly 180 times that of the unirradiated sample. These findings pave the way for further <em>J</em><sub>c</sub> enhancement by optimizing the defect geometry and density, providing valuable insights for the development of high-performance superconducting materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"54 ","pages":"Article 101718"},"PeriodicalIF":10.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143775858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0