Journal of Physics: Condensed Matter最新文献_第9页

Fundamental physical constants, operation of physical phenomena and entropy increase.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-04 DOI: 10.1088/1361-648X/adb9ae

K Trachenko

{"title":"Fundamental physical constants, operation of physical phenomena and entropy increase.","authors":"K Trachenko","doi":"10.1088/1361-648X/adb9ae","DOIUrl":"10.1088/1361-648X/adb9ae","url":null,"abstract":"Approaching the problem of understanding fundamental physical constants (FPCs) started with discussing the role these constants play in high-energy nuclear physics and astrophysics. Condensed matter physics was relatively unexplored in this regard. More recently, it was realised that FPCs set lower or upper bounds on key condensed matter properties. Here, we discuss a much wider role played by FPCs in condensed matter physics: at given environmental conditions, FPCs set the observability and operation of entire physical effects and phenomena. We discuss structural and superconducting phase transitions and transitions between different states of matter, with implications for life processes. We also discuss metastable states, transitions between them, chemical reactions and their products. A byproduct of this discussion is that the order of magnitude of the transition temperature can be calculated from FPCs only. We show that the new states emerging as a result of various transitions increase the phase space and entropy. Were FPCs to take different values, these transitions would become inoperative at our environmental conditions and the new states due to these transitions would not emerge. This suggests that the current values of FPCs, by enabling various transitions and reactions which give rise to new states, promote entropy increase. Based on this entropy increase and the associated increase of statistical probability, we conjecture that entropy increase is a selection principle for FPCs considered to be variable in earlier discussions.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143492499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectroscopy ofd-wave superconductors using DNA as a probing tip.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-03 DOI: 10.1088/1361-648X/adb8b4

Y Takagaki

{"title":"Spectroscopy ofd-wave superconductors using DNA as a probing tip.","authors":"Y Takagaki","doi":"10.1088/1361-648X/adb8b4","DOIUrl":"10.1088/1361-648X/adb8b4","url":null,"abstract":"Andreev reflection in DNA molecules terminated by ad-wave superconductor is investigated for demonstrating advantages in using DNA as the probe for the spectroscopy of the superconductor. DNA molecules are incorporated in the simulations using a two-leg ladder model with a simplification as constructed by homopolymers. The increase of the Andreev reflection probability at zero bias originating from the midgap surface states ofd-wave superconductors appears even when the DNA molecule is coupled strongly. The zero-bias peak is enhanced by orders of magnitude when the coupling is weakened. The one-dimensional transport in DNA strands gives rise to the remarkable sensitivity in the spectroscopy, where the changes of the reflection probability caused by the midgap states are also in orders of magnitude when the voltage bias is varied and when the orientation of thed-wave symmetry is inclined with respect to the superconductor surface. The quantum interference of the transport between the two strands in DNA modifies the zero-bias increase. A narrow dip occurs at zero bias with a plateau sandwiched by two peaks in the immediate vicinity of the zero bias. The characteristics of these transmission resonances are dependent on the parameters describing the model molecules, and so the width of the resonance peaks, for instance, enables us to evaluate the strength of the inter-strand coupling.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced control of surface wave transitions via trapped air film on multiscale structured surfaces.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-03 DOI: 10.1088/1361-648X/adb926

Yan Xing, Tianshun Shen, Qing Tang, Qingfei Fu, Lijun Yang, Ruo-Yu Dong

{"title":"Enhanced control of surface wave transitions via trapped air film on multiscale structured surfaces.","authors":"Yan Xing, Tianshun Shen, Qing Tang, Qingfei Fu, Lijun Yang, Ruo-Yu Dong","doi":"10.1088/1361-648X/adb926","DOIUrl":"10.1088/1361-648X/adb926","url":null,"abstract":"The control of the threshold for surface wave transition is a topic of great interest in both scientific and industrial communities. Traditional methods, like installing baffles, for suppressing surface waves often suffer from issues including increased system weight, lack of flexibility and universality, and problems with structural performance. This study utilizes micro/nanoscale surface modifications and millimeter scale slot structure design to trap air film to absorb vibration energy under liquid surface waves. We directly visualized the trapped air film and systematically examined how variations in slot width and depth influence the harmonic-to-subharmonic wave transition. The synchronized correlation between the transition thresholds and air film displacements at varying slot dimensions was established, indicating the significant role of trapped air in shaping the behavior of surface waves. We further discovered that as the liquid thickness increases, the role of the air film gradually weakens until it reaches a critical thickness. This research offers valuable insights into more efficient surface wave control methods, potentially enhancing the design and stability of precision systems in various industries.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143472584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Presence of enhanced Pauli spin response and 6 eV plasmonic excitation in Ni metal.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-03 DOI: 10.1088/1361-648X/adb8b3

Shivani Bhardwaj, Antik Sihi, Sudhir K Pandey

{"title":"Presence of enhanced Pauli spin response and 6 eV plasmonic excitation in Ni metal.","authors":"Shivani Bhardwaj, Antik Sihi, Sudhir K Pandey","doi":"10.1088/1361-648X/adb8b3","DOIUrl":"10.1088/1361-648X/adb8b3","url":null,"abstract":"We revisit the electronic structure of Nickel (Ni) using the density functional theory (DFT) and dynamical mean-field theory (DMFT) for the theoretical description of its electronic structure properties along with finite-temperature magnetism. Our study provides a comprehensive account of electronic and magnetic properties with the same set of Coulomb interaction parameters,U= 5.78 eV andJ= 1.1 eV calculated using first-principles approach. The nature of theoretical magnetization curves obtained from DFT and DFT + DMFT as well as the experimental curve show deviation from the standard models of magnetism,vizStoner and spin fluctuation model. In comparison to DFT+DMFT method, temperature dependent DFT approach is found to well describe the finite-temperature magnentization curve of Ni below critical temperature (T⩽ 631 K). The study finds significant Pauli-spin susceptibility contribution to paramagnetic spin susceptibility. Excluding the Pauli-spin response yields a linear Curie-Weiss dependence of the inverse paramagnetic susceptibility at higher temperatures. Also, the presence of mixed valence electronic configuration (3d8, 3d9and 3d7) is noted. The competing degrees of both the itinerant and localized moment picture of 3dstates are found to dictate the finite-temperature magnetization of the system. Furthermore, the quasiparticle scattering rate is found to exhibit strong deviation fromT2behavior in temperature leading to the breakdown of conventional Fermi-liquid theory. In addition to the 6 eV satellite, our calculated electronic excitation spectrum shows the possible presence of satellite feature extending ∼10 eV binding energy, which has previously been reported experimentally. Interestingly, ourG0W0results find the presence of plasmonic excitation contribution to the intensity of famous 6 eV satellite along with the electronic correlation effects, paving way for its reinterpretation.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous temperature dependence of spin-orbit coupling in Al₂O₃/SrTiO₃and Al₂O₃/KTaO₃heterostructures.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-03 DOI: 10.1088/1361-648X/adb924

Z Qin, D B Zhou, X R Ma, T Lin, K H Gao

引用次数: 0

Effect of thermally-induced cationic redistribution on the structural and magnetic properties of Cu-substituted zinc ferrite.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-28 DOI: 10.1088/1361-648X/adb824

S Nayak, P K Roy, S Ghorai, A M Padhan, P Svedlindh, P Murugavel

{"title":"Effect of thermally-induced cationic redistribution on the structural and magnetic properties of Cu-substituted zinc ferrite.","authors":"S Nayak, P K Roy, S Ghorai, A M Padhan, P Svedlindh, P Murugavel","doi":"10.1088/1361-648X/adb824","DOIUrl":"10.1088/1361-648X/adb824","url":null,"abstract":"Cationic redistribution in spinel ferrite systems greatly influences the magnetic ordering and the associated phenomena. Here, the effect of the synthesis condition on the cationic redistribution and its correlation with the magnetic properties were explored in the Cu2+substituted ZnFe2O4spinel ferrite. X-ray photoelectron spectroscopy and x-ray diffraction studies reveal that the variation of sintering temperature redistributes the cations between tetrahedral and octahedral sublattices. Results from low field dc-magnetic susceptibility measurements show that the susceptibility increases with decreasing sintering temperature of the sample. Furthermore, the ac-susceptibility results suggest that the sample sintered at 1048 K (1148 K) exhibits spin-glass behavior with a glass transition temperature of ∼49.2 K (47.1 K) and a cluster-glass behavior at a higher temperature of ∼317 K (330 K), characteristics that are absent in the sample sintered at 1248 K. The sample annealed at 1048 K exhibits a magnetocaloric effect with a maximum isothermal entropy change of ∼1.21 J kg-1K-1atμ0H=5T.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soft and Responsive: Rheological Insights into PNIPAM based Microgels and Applications.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-28 DOI: 10.1088/1361-648X/adbb9a

Silvia Franco, Barbara Ruzicka, Roberta Angelini

引用次数: 0

The dHvA effect in Sn-doped PbTe topological crystalline insulator.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb5e5

Duncan Miertschin, Thinh Nguyen, Shengzhi Zhang, Minseong Lee, Sritharan Krishnamoorthi, Rajesh Kumar Ulaganathan, Raman Shankar, David E Graf, Keshav Shrestha

{"title":"The dHvA effect in Sn-doped PbTe topological crystalline insulator.","authors":"Duncan Miertschin, Thinh Nguyen, Shengzhi Zhang, Minseong Lee, Sritharan Krishnamoorthi, Rajesh Kumar Ulaganathan, Raman Shankar, David E Graf, Keshav Shrestha","doi":"10.1088/1361-648X/adb5e5","DOIUrl":"10.1088/1361-648X/adb5e5","url":null,"abstract":"We report the synthesis, electrical transport, magnetotransport, and high-field torque magnetometry studies of the topological crystalline insulator SnxPb1-xTe (x= 0, 0.2, and 0.4). This material undergoes a topological phase transition from trivial to non-trivial at a critical doping ofxc= 0.35. The resistivity increases with applied magnetic field, displaying positive magnetoresistance (MR), which reaches up to 4500% at 14 T for PbTe. However, we did not observe Shubnikov-de Haas oscillations in the MR data. To observe quantum oscillations and explore the Fermi surface topology of this material, we conducted torque magnetometry experiments on samples both below (x= 0.2) and above (x= 0.4) the critical dopingxc= 0.35 with applied magnetic fields up to 35 T. The torque signal from both samples revealed clear de Haas-van Alphen (dHvA) oscillations above 15 T. These oscillations exhibited single dominant frequencies of 90 T forx= 0.2 and 51 T forx= 0.4, providing insights into the Fermi surface properties. Angular and temperature-dependent analyses of the dHvA oscillations were performed using Lifshitz-Kosevich theory to extract key physical parameters of the Fermi surface. Berry phase analysis based on Landau level fan diagrams revealed non-zero values for bothx= 0.2 andx= 0.4, indicating non-trivial topological features. This study provides detailed insights into the quantum oscillations and Fermi surface properties of Sn-doped PbTe/Se compounds, contributing to a deeper understanding of topological crystalline materials and their broader implications for topological physics.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143414153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constructing topological insulator-ferromagnet heterojunctions of Bi₂Se₃/Fe₃GeTe₂and Bi₂Te₃/Fe₃GaTe₂.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb274

Xinke Liang, Fuhong Chen, Liu Yang, Tingting Yang, Peiyao Xiao, Yuxiang Liu, Zhiwei Wang, Wende Xiao

引用次数: 0

Electromagnetism and thermostability of Cr₇C₃synthesised with high-temperature and high-pressure quenching method.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adaf65

Zekun Yu, Chao Zhou, Kuo Bao, Zhaoqing Wang, Pinwen Zhu, Qiang Tao, Tian Cui

{"title":"Electromagnetism and thermostability of Cr7C3synthesised with high-temperature and high-pressure quenching method.","authors":"Zekun Yu, Chao Zhou, Kuo Bao, Zhaoqing Wang, Pinwen Zhu, Qiang Tao, Tian Cui","doi":"10.1088/1361-648X/adaf65","DOIUrl":"10.1088/1361-648X/adaf65","url":null,"abstract":"The interactions between the carbon skeleton and metal atoms in binary transition metal carbides are of particular interest for industrial applications involving advanced physics and chemistry, especially in magnetoelectric functional materials and cemented carbides. Cr and carbon BTMCs are a series of intermetallic compounds with specific chemical formulas that share certain unique characteristics. In this study, we used polycrystalline powders of chromium and carbon as precursors and synthesised single-phase bulk Cr7C3(orthorhombic, space group:Pnma) with high density and good crystallinity using a high-temperature and high-pressure quenching method (HTHPQM). We studied the material properties and electronic structures of Cr7C3with both experimental measurements and density functional theoryab intiosimulations and found that Cr7C3is a conductor with an electrical conductivity (2.32 × 10-3Ω m), relatively high compaction (97.2%), excellent thermostability (oxidation at 1175 K), and a magnetic phase transition from paramagnetism to soft ferromagnetism around 50 K, and the electromagnetic properties are chiefly due to the abundance of the 3delectrons of Cr, and the orbital hybridisation between C and Cr with their 2pand 3delectrons is the reason for the crystal structure and high thermostability. Therefore, the synthesised Cr7C3is a multifunctional material with promising application prospects, and HPHTQM is a simple and effective method for preparing samples.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0