arXiv - PHYS - Materials Science最新文献_第10页

Predicting electrical conductivity in bi-metal composites 预测双金属复合材料的导电性

arXiv - PHYS - Materials Science Pub Date : 2024-09-06 DOI: arxiv-2409.04655

Daniel N. Blaschke, John S. Carpenter, Abigail Hunter

引用次数: 0

The Effect of Blue and Infrared Laser Melting Frequency on Oxide Morphology in 304L 蓝色和红外激光熔化频率对 304L 氧化物形态的影响

arXiv - PHYS - Materials Science Pub Date : 2024-08-09 DOI: arxiv-2408.05144

Jonathan S. Paras, Randy D. Curry, James A. Ohlhausen, Michael J. Abere

引用次数: 0

Precipitation of corrosion products in macroscopic voids at the steel-concrete interface -- observations, mechanisms and research needs 钢-混凝土界面宏观空隙中腐蚀产物的沉淀--观察结果、机理和研究需求

arXiv - PHYS - Materials Science Pub Date : 2024-08-09 DOI: arxiv-2408.05028

Shishir Mundra, Emanuele Rossi, Luka Malenica, Mohit Pundir, Ueli M. Angst

{"title":"Precipitation of corrosion products in macroscopic voids at the steel-concrete interface -- observations, mechanisms and research needs","authors":"Shishir Mundra, Emanuele Rossi, Luka Malenica, Mohit Pundir, Ueli M. Angst","doi":"arxiv-2408.05028","DOIUrl":"https://doi.org/arxiv-2408.05028","url":null,"abstract":"Macroscopic voids at the steel-concrete interface and their degree of\u0000saturation with an aqueous electrolyte are known to play an important role in\u0000the corrosion of steel in reinforced concrete. Irrespective of the exposure\u0000conditions and testing parameters, corrosion products have been reported to\u0000consistently precipitate in a unique pattern within these macroscopic voids,\u0000preferentially along the void walls and growing inward. The underlying\u0000mechanisms governing corrosion product precipitation in macroscopic voids and\u0000their effects on long-term durability remain unclear. Through in-situ X-ray\u0000computed tomography observations, thermodynamic and kinetic considerations, and\u0000numerical modelling of water transport within macroscopic voids, here, we\u0000provide plausible hypotheses of the processes responsible for the precipitation\u0000of corrosion products along the walls of the voids. Understanding the\u0000mechanisms of corrosion product precipitation can offer insights into the\u0000development of stresses in and around the macroscopic interfacial void and the\u0000durability of reinforced concrete structures. This contribution also discusses\u0000opportunities for different avenues for research to elucidate several\u0000multiscale processes that influence the durability of reinforced concrete.","PeriodicalId":501234,"journal":{"name":"arXiv - PHYS - Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dislocation-induced flexoelectricity in SrTiO$_3$ nanostructure from first principles 从第一原理看 SrTiO$_3$ 纳米结构中的位错诱导柔电性

arXiv - PHYS - Materials Science Pub Date : 2024-08-09 DOI: arxiv-2408.04985

Kunihiko Yamauchi, Thi Phuong Thao Nguyen, Tamio Oguchi

引用次数: 0

Giant interfacial Dzyaloshinskii-Moriya Interaction in perovskite La_{0.7}Sr_{0.3}MnO_{3} films 过光体 La_{0.7}Sr_{0.3}MnO_{3} 薄膜中巨大的界面 Dzyaloshinskii-Moriya 相互作用

arXiv - PHYS - Materials Science Pub Date : 2024-08-09 DOI: arxiv-2408.04959

L. Yang, X. Zhang, H. Wang, N. Lei, J. Wang, Y. Sun, L. Liu, Z. Zhao, Y. Yang, D. Wei, D. Pan, J. Zhao, J. Shen, W. g Zhao, H. Lu, W. Wang, H. Yu

{"title":"Giant interfacial Dzyaloshinskii-Moriya Interaction in perovskite La_{0.7}Sr_{0.3}MnO_{3} films","authors":"L. Yang, X. Zhang, H. Wang, N. Lei, J. Wang, Y. Sun, L. Liu, Z. Zhao, Y. Yang, D. Wei, D. Pan, J. Zhao, J. Shen, W. g Zhao, H. Lu, W. Wang, H. Yu","doi":"arxiv-2408.04959","DOIUrl":"https://doi.org/arxiv-2408.04959","url":null,"abstract":"The Dzyaloshinskii-Moriya interaction (DMI) plays a critical role in\u0000stabilizing topological spin textures, a key area of growing interest in\u0000oxide-based spintronics. While most of reported topological phenomena found in\u0000manganites are related to the bulk-like DMI, the understanding of interfacial\u0000DMI and its origin in oxide interfaces remain limited. Here we experimentally\u0000investigate the interfacial DMI of La_{0.7}Sr_{0.3}MnO_{3} (LSMO) films grown\u0000on various substrates by employing spin-wave propagation with drift velocities\u0000at room temperature. Our findings reveal a giant interfacial DMI coefficient\u0000(mathit{D} _{s}) of 1.96 pJ/m in LSMO/NdGaO_{3}(110) system, exceeding\u0000previously reported values in oxides by one to two orders of magnitude.\u0000First-principles calculations further show that with the aid of 6mathit{s}\u0000electrons, the 4mathit{f} electrons from Nd play a key role in enhancing the\u0000spin-orbit coupling of the 3mathit{d} electrons in Mn, ultimately leading to\u0000the observed giant interfacial DMI. This discovery of giant interfacial DMI\u0000through engineering the interface of oxides provides valuable insights for\u0000advancing functional chiral magnonics and spintronics.","PeriodicalId":501234,"journal":{"name":"arXiv - PHYS - Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

All optical excitation of spin polarization in d-wave altermagnets d 波改磁体中自旋极化的全光激发

arXiv - PHYS - Materials Science Pub Date : 2024-08-09 DOI: arxiv-2408.05187

Marius Weber, Stephan Wust, Luca Haag, Akashdeep Akashdeep, Kai Leckron, Christin Schmitt, Rafael Ramos, Takashi Kikkawa, Eiji Saitoh, Mathias Kläui, Libor Šmejkal, Jairo Sinova, Martin Aeschlimann, Gerhard Jakob, Benjamin Stadtmüller, Hans Christian Schneider

{"title":"All optical excitation of spin polarization in d-wave altermagnets","authors":"Marius Weber, Stephan Wust, Luca Haag, Akashdeep Akashdeep, Kai Leckron, Christin Schmitt, Rafael Ramos, Takashi Kikkawa, Eiji Saitoh, Mathias Kläui, Libor Šmejkal, Jairo Sinova, Martin Aeschlimann, Gerhard Jakob, Benjamin Stadtmüller, Hans Christian Schneider","doi":"arxiv-2408.05187","DOIUrl":"https://doi.org/arxiv-2408.05187","url":null,"abstract":"The recently discovered altermagnets exhibit collinear magnetic order with\u0000zero net magnetization but with unconventional spin-polarized d/g/i-wave band\u0000structures, expanding the known paradigms of ferromagnets and antiferromagnets.\u0000In addition to novel current-driven electronic transport effects, the\u0000unconventional time-reversal symmetry breaking in these systems also makes it\u0000possible to obtain a spin response to linearly polarized fields in the optical\u0000frequency domain. We show through ab-initio calculations of the prototypical\u0000d-wave altermagnet RuO$_2$, with $[C_2|C_{4z}]$ symmetry combining twofold\u0000spin rotation with fourfold lattice rotation, that there is an optical analogue\u0000of a spin splitter effect, as the coupling to a linearly polarized exciting\u0000laser field makes the d-wave character of the altermagnet directly visible. By\u0000magneto-optical measurements on RuO$_2$ films of a few nanometer thickness, we\u0000demonstrate the predicted connection between the polarization of an ultrashort\u0000pump pulse and the sign and magnitude of a persistent optically excited\u0000electronic spin polarization. Our results point to the possibility of exciting\u0000and controlling the electronic spin polarization in altermagnets by such\u0000ultrashort optical pulses. In addition, the possibility of exciting an\u0000electronic spin polarization by linearly polarized optical fields in a\u0000compensated system is a unique consequence of the altermagnetic material\u0000properties, and our experimental results therefore present an indication for\u0000the existence of an altermagnetic phase in ultrathin RuO$_2$ films.","PeriodicalId":501234,"journal":{"name":"arXiv - PHYS - Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of colored disorder on the heat conductivity of SiGe alloys from first principles 从第一原理看有色无序对 SiGe 合金导热性的影响

arXiv - PHYS - Materials Science Pub Date : 2024-08-09 DOI: arxiv-2408.05155

Alfredo Fiorentino, Paolo Pegolo, Stefano Baroni, Davide Donadio

引用次数: 0

Giant electro-optic and elasto-optic effects in ferroelectric NbOI$_{2}$ 铁电 NbOI$_{2}$ 中的巨大电光和弹光效应

arXiv - PHYS - Materials Science Pub Date : 2024-08-08 DOI: arxiv-2408.04225

Zhenlong Zhang, Xuehan Di, Charles Paillard, Laurent Bellaiche, Zhijun Jiang

引用次数: 0

Electrical resistivity, thermal conductivity, and viscosity of Fe-H alloys at Earth's core conditions 地核条件下 Fe-H 合金的电阻率、热导率和粘度

arXiv - PHYS - Materials Science Pub Date : 2024-08-08 DOI: arxiv-2408.04521

Cong Liu, Ronald Cohen

{"title":"Electrical resistivity, thermal conductivity, and viscosity of Fe-H alloys at Earth's core conditions","authors":"Cong Liu, Ronald Cohen","doi":"arxiv-2408.04521","DOIUrl":"https://doi.org/arxiv-2408.04521","url":null,"abstract":"The transport properties (electrical resistivity, thermal conductivity, and\u0000viscosity) of iron-hydrogen alloy are of great significance in the stability\u0000and evolution of planetary magnetic fields. Here, we investigate the thermal\u0000transport properties of iron doped with varying hydrogen content as functions\u0000of pressure (P) and temperature (T) for the top and bottom of Earth's outer\u0000core and beyond, corresponding to pressures of about 130 to 300 GPa and\u0000temperatures of 4000 to 7000 K. Using first-principles density functional\u0000theory molecular dynamic simulations (FPMD), we verify that crystalline FeH$_x$\u0000is superionic with H diffusing freely. We find a low frequency viscosity of\u000010-11 mPa$cdot$s for liquid Fe-H alloys at Earth's outer core conditions by\u0000the linear response Green-Kubo formula. Using the KKR method within density\u0000functional theory (DFT) plus Dynamical mean-field Theory (DMFT), we find\u0000saturation of electrical resistivity with increasing temperatures in liquid\u0000iron at outer core conditions. The effect of H on electrical and thermal\u0000transport we find is small, so that the exact H content of the core is not\u0000needed. The primary effect of H is on the equation of state, decreasing the\u0000density at constant P and T. We find the Lorenz number is smaller than the\u0000ideal value, and obtain for X(H)= 0.20, or 0.45 wt% H , thermal conductivity\u0000$kappa$ of $sim$105 and $sim$190 $Wm^{-1}K^{-1}$, respectively, at\u0000conditions near the core-mantle and inner-outer core boundary.","PeriodicalId":501234,"journal":{"name":"arXiv - PHYS - Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hidden elastic softness of low-symmetry frustrated $A$Ti$_2$O$_5$ ($A$ = Co, Fe) 低对称性失谐$A$Ti$_2$O$_5$ ($A$ = Co, Fe)的隐藏弹性软度

arXiv - PHYS - Materials Science Pub Date : 2024-08-07 DOI: arxiv-2408.03783

Tadataka Watanabe, Kazuya Takayanagi, Ray Nishimura, Yoshiaki Hara, Dharmalingam Prabhakaran, Roger D. Johnson, Stephen J. Blundell

{"title":"Hidden elastic softness of low-symmetry frustrated $A$Ti$_2$O$_5$ ($A$ = Co, Fe)","authors":"Tadataka Watanabe, Kazuya Takayanagi, Ray Nishimura, Yoshiaki Hara, Dharmalingam Prabhakaran, Roger D. Johnson, Stephen J. Blundell","doi":"arxiv-2408.03783","DOIUrl":"https://doi.org/arxiv-2408.03783","url":null,"abstract":"Orthorhombic pseudobrookites CoTi$_2$O$_5$ and FeTi$_2$O$_5$ have a\u0000low-symmetry crystal structure comprising magnetic Co$^{2+}$/Fe$^{2+}$ ions and\u0000nonmagnetic Ti$^{4+}$ ions, where the orbital-nondegenerate Co$^{2+}$/Fe$^{2+}$\u0000ions form one-dimensional chains running along the orthorhombic $a$ axis. These\u0000compounds undergo an antiferromagnetic phase transition at $T_N sim$ 26 K for\u0000CoTi$_2$O$_5$ and $T_N sim$ 40 K for FeTi$_2$O$_5$. We perform ultrasound\u0000velocity measurements on single crystals of CoTi$_2$O$_5$ and FeTi$_2$O$_5$.\u0000The measurements of these compounds reveal that the symmetry-lowering elastic\u0000modes of shear elastic moduli exhibit unusual elastic softness in the\u0000paramagnetic phase above $T_N$. This elastic softness indicates the presence of\u0000spin-lattice-coupled fluctuations above $T_N$ that should be a precursor to the\u0000symmetry-lowering lattice distortion at $T_N$. Furthermore, it is revealed that\u0000the magnitude of the unusual elastic softness is larger in CoTi$_2$O$_5$ than\u0000in FeTi$_2$O$_5$, which indicates that the spin-lattice coupling is stronger in\u0000CoTi$_2$O$_5$ than in FeTi$_2$O$_5$. The present study suggests that\u0000CoTi$_2$O$_5$ and FeTi$_2$O$_5$ are unique spin Jahn--Teller systems with low\u0000crystal symmetry, where, although the nature of exchange interactions is\u0000quasi-one-dimensional, the three-dimensional spin-lattice coupling releases the\u0000frustration by further lowering the crystal symmetry.","PeriodicalId":501234,"journal":{"name":"arXiv - PHYS - Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0