arXiv: Materials Science最新文献_第3页

Nutation in antiferromagnetic resonance 反铁磁共振中的章动

arXiv: Materials Science Pub Date : 2020-12-04 DOI: 10.1103/PHYSREVB.103.104404

Ritwik Mondal, Sebastian Großenbach, Levente Rózsa, U. Nowak

引用次数: 9

Halide perovskites: third generation photovoltaic materials empowered by metavalent bonding 卤化物钙钛矿:第三代元价键合光伏材料

arXiv: Materials Science Pub Date : 2020-12-03 DOI: 10.21203/rs.3.rs-116034/v1

M. Wuttig, C. Schoen, Mathias Schumacher, J. Robertson, Pavlo Golub, E. Bousquet, J. Raty

引用次数: 3

Spin-spiral state of a Mn monolayer on W(110) studied by soft x-ray absorption spectroscopy at variable temperatures 软x射线吸收光谱在变温度下研究了W(110)上Mn单分子层的自旋螺旋态

arXiv: Materials Science Pub Date : 2020-12-03 DOI: 10.1103/PhysRevB.103.174419

J. Honolka, S. Krotzky, M. Menzel, T. Herden, V. Sessi, H. Ebert, J. Minár, K. Bergmann, R. Wiesendanger, O. Šipr

{"title":"Spin-spiral state of a Mn monolayer on W(110) studied by soft x-ray absorption spectroscopy at variable temperatures","authors":"J. Honolka, S. Krotzky, M. Menzel, T. Herden, V. Sessi, H. Ebert, J. Minár, K. Bergmann, R. Wiesendanger, O. Šipr","doi":"10.1103/PhysRevB.103.174419","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.174419","url":null,"abstract":"The noncollinear magnetic state of epitaxial Mn monolayers on tungsten (110) crystal surfaces is investigated by means of soft x-ray absorption spectroscopy, to complement earlier spin-polarized STM experiments. X-ray absorption spectra (XAS), x-ray linear dichroism (XLD) and x-ray magnetic circular dichroism (XMCD) Mn L23-edge spectra were measured in the temperature range from 8 to 300 K and compared to results of fully-relativistic ab initio calculations. We show that antiferromagnetic (AFM) helical and cycloidal spirals give rise to significantly different Mn L23-edge XLD signals, enabling thus to distinguish between them. It follows from our results that the magnetic ground state of a Mn monolayer on W(110) is an AFM cycloidal spin spiral. Based on temperature-dependent XAS, XLD and field-induced XMCD spectra we deduce that magnetic properties of the Mn monolayer on W(110) vary with temperature, but this variation lacks a clear indication of a phase transition in the investigated temperature range up to 300 K - even though a crossover exists around 170 K in the temperature dependence of XAS branching ratios and in XLD profiles.","PeriodicalId":8467,"journal":{"name":"arXiv: Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73054167","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: 1

Atomic forces by quantum Monte Carlo: Application to phonon dispersion calculations 量子蒙特卡罗原子力:声子色散计算的应用

arXiv: Materials Science Pub Date : 2020-12-02 DOI: 10.1103/PHYSREVB.103.L121110

K. Nakano, Tommaso Morresi, M. Casula, R. Maezono, S. Sorella

引用次数: 9

Above-room-temperature giant thermal conductivity switching in spintronic multilayers 自旋电子多层中的室温以上巨热导率开关

arXiv: Materials Science Pub Date : 2020-11-30 DOI: 10.1063/5.0032531

H. Nakayama, Bin Xu, S. Iwamoto, K. Yamamoto, R. Iguchi, A. Miura, T. Hirai, Y. Miura, Y. Sakuraba, J. Shiomi, K. Uchida

{"title":"Above-room-temperature giant thermal conductivity switching in spintronic multilayers","authors":"H. Nakayama, Bin Xu, S. Iwamoto, K. Yamamoto, R. Iguchi, A. Miura, T. Hirai, Y. Miura, Y. Sakuraba, J. Shiomi, K. Uchida","doi":"10.1063/5.0032531","DOIUrl":"https://doi.org/10.1063/5.0032531","url":null,"abstract":"Thermal switching provides an effective way for active heat flow control, which has recently attracted increasing attention in terms of nanoscale thermal management technologies. In magnetic and spintronic materials, the thermal conductivity depends on the magnetization configuration: this is the magneto-thermal resistance effect. Here we show that an epitaxial Cu/Co$_{50}$Fe$_{50}$ multilayer film exhibits giant magnetic-field-induced modulation of the cross-plane thermal conductivity. The magneto-thermal resistance ratio for the Cu/Co$_{50}$Fe$_{50}$ multilayer reaches 150% at room temperature, which is much larger than the previous record high. Although the ratio decreases with increasing the temperature, the giant magneto-thermal resistance effect of ~100% still appears up to 400 K. The magnetic field dependence of the thermal conductivity of the Cu/Co$_{50}$Fe$_{50}$ multilayer was observed to be about twice greater than that of the cross-plane electrical conductivity. The observation of the giant magneto-thermal resistance effect clarifies a potential of spintronic multilayers as thermal switching devices.","PeriodicalId":8467,"journal":{"name":"arXiv: Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78374434","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: 10

Stress distribution at the AlN/SiC heterointerface probed by Raman spectroscopy 拉曼光谱探测AlN/SiC异质界面的应力分布

arXiv: Materials Science Pub Date : 2020-11-27 DOI: 10.1063/5.0029682

I. Breev, K. V. Likhachev, V. Yakovleva, René Hübner, G. Astakhov, P. Baranov, E. N. Mokhov, A. Anisimov

{"title":"Stress distribution at the AlN/SiC heterointerface probed by Raman spectroscopy","authors":"I. Breev, K. V. Likhachev, V. Yakovleva, René Hübner, G. Astakhov, P. Baranov, E. N. Mokhov, A. Anisimov","doi":"10.1063/5.0029682","DOIUrl":"https://doi.org/10.1063/5.0029682","url":null,"abstract":"We grow AlN/4H-SiC and AlN/6H-SiC heterostructures by physical vapor deposition and characterize the heterointerface with nanoscale resolution. Furthermore, we investigate the spatial stress and strain distribution in these heterostructures using confocal Raman spectroscopy. We measure the spectral shifts of various vibrational Raman modes across the heterointerface and along the entire depth of the 4H- and 6H-SiC layers. Using the earlier experimental prediction for the phonon-deformation potential constants, we determine the stress tensor components in SiC as a function of the distance from the AlN/SiC heterointerface. In spite that the lattice parameter of SiC is smaller than that of AlN, the SiC layers are compressively strained at the heterointerface. This counterintuitive behavior is explained by different coefficients of thermal expansion of SiC and AlN when the heterostructures are cooled from growth to room temperature. The compressive stress values are maximum at the heterointerface, approaching one GPa, and relaxes to the equilibrium value on the scale of several tens of microns from the heterointerface.","PeriodicalId":8467,"journal":{"name":"arXiv: Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74684507","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: 5

The influence of growth interruption on the luminescence properties of Ga(As,Sb)-based type II heterostructures 生长中断对Ga(As,Sb)基II型异质结构发光性能的影响

arXiv: Materials Science Pub Date : 2020-11-27 DOI: 10.1016/j.jlumin.2020.117817

Luise Rost, J. Lehr, Milan Maradiya, Lukas Hellweg, Florian Fillsack, W. Stolz, W. Heimbrodt

引用次数: 1

Giant orbital diamagnetism of three-dimensional Dirac electrons in Sr3PbO antiperovskite Sr3PbO反钙钛矿中三维狄拉克电子的巨轨道抗磁性

arXiv: Materials Science Pub Date : 2020-11-26 DOI: 10.1103/PHYSREVB.103.115117

S. Suetsugu, Kentaro Kitagawa, T. Kariyado, A. Rost, J. Nuss, Claus Mühle, Masao Ogata, H. Takagi

{"title":"Giant orbital diamagnetism of three-dimensional Dirac electrons in \u0000Sr3PbO\u0000 antiperovskite","authors":"S. Suetsugu, Kentaro Kitagawa, T. Kariyado, A. Rost, J. Nuss, Claus Mühle, Masao Ogata, H. Takagi","doi":"10.1103/PHYSREVB.103.115117","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.115117","url":null,"abstract":"In Dirac semimetals, inter-band mixing has been known theoretically to give rise to a giant orbital diamagnetism when the Fermi level is close to the Dirac point. In Bi$ _{1-x}$Sb$ _x$ and other Dirac semimetals, an enhanced diamagnetism in the magnetic susceptibility $chi$ has been observed and interpreted as a manifestation of such giant orbital diamagnetism. Experimentally proving their orbital origin, however, has remained challenging. Cubic antiperovskite Sr$ _3$PbO is a three-dimensional Dirac electron system and shows the giant diamagnetism in $chi$ as in the other Dirac semimetals. $ ^{207}$Pb NMR measurements are conducted in this study to explore the microscopic origin of diamagnetism. From the analysis of the Knight shift $K$ as a function of $chi$ and the relaxation rate $T_1^{-1}$ for samples with different hole densities, the spin and the orbital components in $K$ are successfully separated. The results establish that the enhanced diamagnetism in Sr$ _3$PbO originates from the orbital contribution of Dirac electrons, which is fully consistent with the theory of giant orbital diamagnetism.","PeriodicalId":8467,"journal":{"name":"arXiv: Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90391902","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: 8

Introduction of Sr into Bi2Se3 thin films by molecular beam epitaxy 分子束外延将Sr引入Bi2Se3薄膜

arXiv: Materials Science Pub Date : 2020-11-25 DOI: 10.1063/5.0039761

L. Riney, C. Bunker, S. Bac, J. Wang, D. Battaglia, Yun-Chang Park, M. Dobrowolska, J. Furdyna, X. Liu, B. Assaf

引用次数: 2

Ab initio anharmonic thermodynamic properties of cubic CaSiO3 perovskite 立方CaSiO3钙钛矿的从头算非调和热力学性质

arXiv: Materials Science Pub Date : 2020-11-25 DOI: 10.1103/PHYSREVB.103.104108

Zhen Zhang, R. Wentzcovitch

引用次数: 4