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First-principles study of the order-disorder transition in the AlCrTiV high entropy alloy 铝铬钛钒高熵合金有序-无序转变的第一性原理研究
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-10 DOI: 10.1103/physrevmaterials.8.093603
Michael Widom
The AlCrTiV high entropy alloy undergoes an order-disorder transition from body-centered cubic (Strukturbericht A2) at high temperatures to the CsCl structure (B2) at intermediate temperatures. We model this transition using first principles Monte Carlo/molecular dynamics simulations. Simulation results yield the temperature-dependent energy, entropy, heat capacity, occupancy fluctuations, and diffraction patterns. The contribution of chemical disorder to the entropy is calculated on the basis of point and pair cluster frequencies. The simulated structures exhibit compensated ferrimagnetism, and the Fermi level lies in a pseudogap. Sensitivity of structure and magnetism to the exchange-correlation functional is discussed, and neutron diffraction experiments are proposed to help resolve the true chemical order.
AlCrTiV 高熵合金经历了从高温下的体心立方结构(Strukturbericht A2)到中温下的氯化铯结构(B2)的有序-无序转变。我们利用第一原理蒙特卡洛/分子动力学模拟对这一转变进行了建模。模拟结果得出了与温度相关的能量、熵、热容量、占位波动和衍射图样。化学无序对熵的贡献是根据点和对簇频率计算出来的。模拟结构表现出补偿铁磁性,费米级位于伪缺口中。讨论了结构和磁性对交换相关函数的敏感性,并建议用中子衍射实验来帮助解决真正的化学秩序问题。
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引用次数: 0
Magnetic properties of the quasi-XY Shastry-Sutherland magnet Er2Be2SiO7 准 XY Shastry-Sutherland 磁体 Er2Be2SiO7 的磁特性
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-10 DOI: 10.1103/physrevmaterials.8.094001
A. Brassington, Q. Ma, G. Sala, A. I. Kolesnikov, K. M. Taddei, Y. Wu, E. S. Choi, H. Wang, W. Xie, J. Ma, H. D. Zhou, A. A. Aczel
Polycrystalline and single-crystal samples of the insulating Shastry-Sutherland compound Er2Be2SiO7 were synthesized via a solid-state reaction and the floating zone method, respectively. The crystal structure, Er single-ion anisotropy, zero-field magnetic ground state, and magnetic phase diagrams along high-symmetry crystallographic directions were investigated with bulk measurement techniques, x-ray and neutron diffraction, and neutron spectroscopy. We establish that Er2Be2SiO7 crystallizes in a tetragonal space group with planes of orthogonal Er dimers and a strong preference for the Er moments to lie in the local plane perpendicular to each dimer bond. We also find that this system has a noncollinear ordered ground state in zero field with a transition temperature of 0.841 K consisting of antiferromagnetic dimers and in-plane moments. Finally, we mapped out the HT phase diagrams for Er2Be2SiO7 along the directions H [001], [100], and [110]. While an increasing in-plane field simply induces a phase transition to a field-polarized phase, we identify three metamagnetic transitions in the H [001] case. Single-crystal neutron diffraction results reveal that the H [001] phase diagram can be explained predominantly by the expected field-induced behavior of classical, anisotropic moments, although the microscopic origin of one phase requires further investigation.
通过固态反应和浮区法分别合成了绝缘的 Shastry-Sutherland 化合物 Er2Be2SiO7 的多晶和单晶样品。通过体测量技术、X 射线和中子衍射以及中子光谱,研究了晶体结构、Er 单离子各向异性、零场磁基态以及沿高对称晶体学方向的磁相图。我们确定 Er2Be2SiO7 在正交 Er 二聚体平面的四方空间群中结晶,并且 Er 矩强烈倾向于位于垂直于每个二聚体键的局部平面内。我们还发现,该体系在零场中具有非共轭有序基态,其转变温度为 0.841 K,由反铁磁性二聚体和平面内矩组成。最后,我们绘制了 Er2Be2SiO7 沿着 H∥ [001]、[100] 和 [110] 方向的 H-T 相图。虽然面内磁场的增大只会引起向场极化相的相变,但我们在 H∥ [001] 的情况下发现了三种元磁转变。单晶中子衍射结果表明,H∥ [001] 相图主要可以用经典各向异性力矩的预期场诱导行为来解释,尽管其中一个相的微观起源还需要进一步研究。
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引用次数: 0
Symmetry-driven large tunneling magnetoresistance in SrRuO3 magnetic tunnel junctions with perpendicular magnetic anisotropy 具有垂直磁各向异性的 SrRuO3 磁性隧道结中对称驱动的大隧道磁阻
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-10 DOI: 10.1103/physrevmaterials.8.l091401
Anouk S. Goossens, Kartik Samanta, Azminul Jaman, Wissem Boubaker, Job J. L. van Rijn, Evgeny Y. Tsymbal, Tamalika Banerjee
Magnetic tunnel junctions (MTJs) that are comprised of epitaxially grown complex oxides offer a versatile platform to control the symmetry of tunneling states and tailor magnetic anisotropy useful for practical applications. This work employs thin films of SrTiO3 as an insulating barrier deposited between two ferromagnetic SrRuO3 electrodes to form fully epitaxial MTJs and demonstrate these functionalities. Transport measurements demonstrate large tunneling magnetoresistance (TMR), significantly exceeding previously found values of TMR in MTJs based on SrRuO3 electrodes. These results are explained by perpendicular magnetic anisotropy of SrRuO3 and matching (mismatching) between symmetry and spin across the SrTiO3/SrRuO3 (001) interface for the parallel (antiparallel) MTJ magnetization state, supported by density functional (DFT) calculations. The angular variation of TMR indicates that the SrRuO3 electrodes contain multiple magnetic domains, allowing the devices to exhibit at least three stable resistance states.
由外延生长的复杂氧化物组成的磁隧道结(MTJ)为控制隧道态的对称性和定制实际应用中有用的磁各向异性提供了一个多功能平台。这项研究利用沉积在两个铁磁性 SrRuO3 电极之间的 SrTiO3 薄膜作为绝缘栅,形成完全外延的 MTJ,并展示了这些功能。传输测量结果表明隧穿磁阻(TMR)很大,大大超过了以前在基于 SrRuO3 电极的 MTJ 中发现的 TMR 值。这些结果的原因是 SrRuO3 的垂直磁各向异性以及 SrTiO3/SrRuO3 (001) 界面的对称性和自旋之间的匹配(不匹配),以实现 MTJ 磁化状态的平行(反平行),并得到密度泛函(DFT)计算的支持。TMR 的角度变化表明,SrRuO3 电极包含多个磁畴,从而使器件能够呈现至少三种稳定的电阻状态。
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引用次数: 0
Recurrence of superconductivity in thickness-gradient La1.81Ce0.19CuO4−δ film 厚度梯度 La1.81Ce0.19CuO4-δ 薄膜中超导性的复现
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-09 DOI: 10.1103/physrevmaterials.8.094801
Sijia Tu, Jinsong Zhang, Zefeng Lin, Beiyi Zhu, Qihong Chen, Jie Yuan, Kui Jin
We report a systematic study of the thickness effect on the superconductivity of overdoped La2xCexCuO4δ films. As the film thickness decreases, a recurrence of superconductivity is observed in the x=0.19 film, while this doping level is commonly expected to show Fermi liquid behavior. The superconducting critical temperatures exhibit a domelike shape with varying thickness. The magnetic susceptibility measurements suggest that the presence of superconductivity in thin films should be filamentary. The combined effect of stress and oxygen in the thickness-gradient films is proposed to comprehend the experimental observations. Our findings provide new perspectives on superconductivity in other systems, such as the hotly debated nickelate superconductors.
我们报告了一项关于厚度对过度掺杂的 La2-xCexCuO4-δ 薄膜超导性影响的系统研究。随着薄膜厚度的减小,在 x=0.19 薄膜中观察到了超导电性的复现,而这一掺杂水平通常被认为会表现出费米液体行为。随着厚度的变化,超导临界温度呈现圆球状。磁感应强度测量结果表明,薄膜中的超导现象应该是丝状的。我们提出了厚度梯度薄膜中应力和氧的共同作用来理解实验观察结果。我们的发现为其他系统中的超导现象提供了新的视角,例如备受争议的镍酸盐超导体。
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引用次数: 0
Absence of itinerant ferromagnetism in a cobalt-based oxypnictide 钴基氧化物中不存在巡回铁磁性
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-09 DOI: 10.1103/physrevmaterials.8.094405
Hua-Xun Li, Hao Jiang, Yi-Qiang Lin, Jia-Xin Li, Shi-Jie Song, Qin-Qing Zhu, Zhi Ren, Guang-Han Cao
We report a layered transition-metal-ordered oxypnictide Sr2CrCoAsO3. The new material was synthesized by solid-state reactions under vacuum. It has an intergrowth structure with a perovskite-like Sr3Cr2O6 unit and ThCr2Si2-type SrCo2As2 block stacking coherently along the crystallographic c axis. The measurements of electrical resistivity, magnetic susceptibility, and specific heat indicate metallic conductivity from the CoAs layers and short-range antiferromagnetic ordering in the CrO2 planes. No itinerant-electron ferromagnetism expected in CoAs layers is observed. This result, combined with the first-principles calculations and the previous reports of other CoAs-layer-based materials, suggests that the CoCo bond length plays a crucial role in the emergence of itinerant ferromagnetism.
我们报告了一种层状过渡金属有序氧化锑 Sr2CrCoAsO3。这种新材料是在真空条件下通过固态反应合成的。它具有一种互生结构,其中包晶型 Sr3Cr2O6 单元和 ThCr2Si2 型 SrCo2As2 嵌段沿晶体学 c 轴相干堆叠。电阻率、磁感应强度和比热的测量结果表明,CoAs 层具有金属导电性,CrO2 平面具有短程反铁磁有序性。在 CoAs 层中没有观察到预期的迭电子铁磁性。这一结果与第一原理计算结果以及之前关于其他 CoAs 层基材料的报道相结合,表明 Co-Co 键长度在巡回铁磁性的出现中起着至关重要的作用。
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引用次数: 0
Tuning magnetic correlations in s=1/2 spin ladder Ba2CuTe1−xWxO6 through site-selective cation substitution 通过位点选择性阳离子置换调谐 s=1/2 自旋梯 Ba2CuTe1-xWxO6 中的磁相关性
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1103/physrevmaterials.8.094404
Muskan Sande, Joydev Khatua, Youngsu Choi, Kwang-Yong Choi
The site-selective substitution of diamagnetic d10/d0 cations offers an efficient way to fine-tune magnetic characteristics by controlling orbital hybridization and superexchange pathways. Herein, we explore the tunability of magnetic properties in coupled spin-ladder compounds Ba2CuTe1xWxO6 (x=0.00.30). The pristine compound exhibits spin-singlet correlations at elevated temperatures, as evidenced by a magnetic susceptibility peak at Tmax70 K, Schottky-like specific heat, unconventional magnetic Raman scattering, and a quasilinear decrease in the electron spin resonance linewidth. Notably, the substitution of W6+ for Te6+ brings about several marked changes: an increase in the Curie-Weiss temperature, a suppression in the Néel ordering temperature, enhanced magnetic susceptibility at low temperatures, and a weakening of spin-ladder correlations. These modifications collectively suggest that the newly activated exchange interactions through W6+ substitution primarily alter intraladder spin topology while amplifying quantum critical fluctuations. This finding highlights the potential for controlling magnetic correlations in spin-ladder compounds through targeted chemical substitution.
二磁性 d10/d0 阳离子的位点选择性取代为通过控制轨道杂化和超交换途径来微调磁特性提供了一种有效的方法。在此,我们探索了耦合自旋阶梯化合物 Ba2CuTe1-xWxO6 (x=0.0-0.30) 的磁特性可调性。原始化合物在高温下表现出自旋小卫星相关性,表现为在 Tmax∼70 K 出现磁感应强度峰、肖特基式比热、非常规磁性拉曼散射以及电子自旋共振线宽的类线性下降。值得注意的是,用 W6+ 替代 Te6+ 带来了几个明显的变化:居里-韦斯温度升高、奈尔有序温度降低、低温磁感应强度增强以及自旋阶梯相关性减弱。这些变化共同表明,通过 W6+ 替代新激活的交换相互作用主要改变了阶梯内部的自旋拓扑结构,同时放大了量子临界波动。这一发现凸显了通过有针对性的化学取代来控制自旋梯化合物磁相关性的潜力。
{"title":"Tuning magnetic correlations in s=1/2 spin ladder Ba2CuTe1−xWxO6 through site-selective cation substitution","authors":"Muskan Sande, Joydev Khatua, Youngsu Choi, Kwang-Yong Choi","doi":"10.1103/physrevmaterials.8.094404","DOIUrl":"https://doi.org/10.1103/physrevmaterials.8.094404","url":null,"abstract":"The site-selective substitution of diamagnetic <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mrow><mi>d</mi></mrow><mn>10</mn></msup><mo>/</mo><msup><mrow><mi>d</mi></mrow><mn>0</mn></msup></mrow></math> cations offers an efficient way to fine-tune magnetic characteristics by controlling orbital hybridization and superexchange pathways. Herein, we explore the tunability of magnetic properties in coupled spin-ladder compounds <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">B</mi><msub><mi mathvariant=\"normal\">a</mi><mn>2</mn></msub><mi>CuT</mi><msub><mi mathvariant=\"normal\">e</mi><mrow><mn>1</mn><mrow><mtext>−</mtext><mi>x</mi></mrow></mrow></msub><msub><mi mathvariant=\"normal\">W</mi><mi>x</mi></msub><msub><mi mathvariant=\"normal\">O</mi><mn>6</mn></msub></mrow></math> (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>x</mi><mo>=</mo><mn>0.0</mn><mo>−</mo><mn>0.30</mn></mrow></math>). The pristine compound exhibits spin-singlet correlations at elevated temperatures, as evidenced by a magnetic susceptibility peak at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>T</mi><mi>max</mi></msub><mo>∼</mo><mn>70</mn></mrow></math> K, Schottky-like specific heat, unconventional magnetic Raman scattering, and a quasilinear decrease in the electron spin resonance linewidth. Notably, the substitution of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi mathvariant=\"normal\">W</mi></mrow><mrow><mn>6</mn><mo>+</mo></mrow></msup></math> for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">T</mi><msup><mrow><mi mathvariant=\"normal\">e</mi></mrow><mrow><mn>6</mn><mo>+</mo></mrow></msup></mrow></math> brings about several marked changes: an increase in the Curie-Weiss temperature, a suppression in the Néel ordering temperature, enhanced magnetic susceptibility at low temperatures, and a weakening of spin-ladder correlations. These modifications collectively suggest that the newly activated exchange interactions through <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi mathvariant=\"normal\">W</mi></mrow><mrow><mn>6</mn><mo>+</mo></mrow></msup></math> substitution primarily alter intraladder spin topology while amplifying quantum critical fluctuations. This finding highlights the potential for controlling magnetic correlations in spin-ladder compounds through targeted chemical substitution.","PeriodicalId":20545,"journal":{"name":"Physical Review Materials","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Uncovering the presence or absence of photoluminescence from iron ions in crystals 揭示晶体中是否存在铁离子发出的光致发光
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1103/physrevmaterials.8.095201
Qiaoling Chen, Qianshan Quan, Chang-Kui Duan
The poor understanding of the optical transitions and luminescent mechanisms critically hindered the development of near-infrared (NIR) Fe3+-activated phosphors, and efficient luminescence from Fe(Oh) has rarely been reported. In our study, we delve into these challenges and realize their correlation with the quenching mechanism of Fe3+ luminescence. First-principles calculations are utilized to analyze energy levels and electron-phonon coupling parameters, further elucidating potential deactivation pathways and factors influencing the occurrence of photoluminescence. A heuristic rule based on ligand-field strength, determined by the absorption wavelength of Cr3+ occupying the same octahedral site in oxides, is proposed to facilitate the prediction of both the potential and wavelength of Fe3+ emission. Our study offers consistent and reliable interpretations for the difficulties and challenges of iron-doped crystals, and provides valuable insights on the design and optimization of Fe3+-based phosphors.
对光学跃迁和发光机制的不甚了解严重阻碍了近红外(NIR)Fe3+ 激活荧光粉的发展,而 Fe(Oh)的高效发光也鲜有报道。在我们的研究中,我们深入探讨了这些难题,并认识到它们与 Fe3+ 发光的淬灭机制之间的关联。我们利用第一原理计算分析了能级和电子-声子耦合参数,进一步阐明了潜在的失活途径和影响光致发光发生的因素。我们提出了一个基于配体场强的启发式规则,该规则由占据氧化物中相同八面体位点的 Cr3+ 的吸收波长决定,有助于预测 Fe3+ 的发射电位和波长。我们的研究为掺铁晶体的困难和挑战提供了一致而可靠的解释,并为设计和优化基于 Fe3+ 的荧光粉提供了宝贵的见解。
{"title":"Uncovering the presence or absence of photoluminescence from iron ions in crystals","authors":"Qiaoling Chen, Qianshan Quan, Chang-Kui Duan","doi":"10.1103/physrevmaterials.8.095201","DOIUrl":"https://doi.org/10.1103/physrevmaterials.8.095201","url":null,"abstract":"The poor understanding of the optical transitions and luminescent mechanisms critically hindered the development of near-infrared (NIR) <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>-activated phosphors, and efficient luminescence from Fe(Oh) has rarely been reported. In our study, we delve into these challenges and realize their correlation with the quenching mechanism of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> luminescence. First-principles calculations are utilized to analyze energy levels and electron-phonon coupling parameters, further elucidating potential deactivation pathways and factors influencing the occurrence of photoluminescence. A heuristic rule based on ligand-field strength, determined by the absorption wavelength of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>Cr</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> occupying the same octahedral site in oxides, is proposed to facilitate the prediction of both the potential and wavelength of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> emission. Our study offers consistent and reliable interpretations for the difficulties and challenges of iron-doped crystals, and provides valuable insights on the design and optimization of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>-based phosphors.","PeriodicalId":20545,"journal":{"name":"Physical Review Materials","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Structural mechanism of the magnetic phase transitions in FeTiO3 FeTiO3 中磁性相变的结构机制
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1103/physrevmaterials.8.093602
A. Zafar, A. M. Milinda Abeykoon, V. Petkov
The structural mechanism of the magnetic phase transitions in FeTiO3 ilmenite, including the paramagnetic (PM) to antiferromagnetic (AFM) transition induced by reducing temperature in zero magnetic field and the AFM to ferromagnetic (FM) transition induced by applying strong magnetic field at a fixed temperature below the Néel temperature, TN, are studied by total synchrotron x-ray scattering. It is found that in both cases the concerted effect of Coulomb repulsion, spin-orbit coupling, and exchange interactions is what determines the response of the crystal lattice to variations in external perturbations such as temperature and magnetic field. In particular, due to strong spin-orbit coupling and Coulomb repulsion, Fe and Ti atoms move in sync along the c axis of the crystal lattice such that their separation changes by less than 1%. At the same time, due to strong intralayer ferromagnetic interactions, the Fe-O-Fe bond angle becomes closer to 90. Notably, the direction of the motion occuring during the temperature-induced PM to AFM transition is opposite to that occuring during the magnetic field-induced AFM to FM transition. Altogether, the seemingly simple FeTiO3 ilmenite behaves like a complex physical system where charge, spin, orbital, and lattice degrees of freedom are strongly coupled. Our findings are likely to be relevant to other members of the ilmenite family and spin-orbit coupled magnetic insulators in general.
通过全同步加速器 X 射线散射研究了 FeTiO3 钛铁矿中磁性相变的结构机制,包括在零磁场中降低温度诱导的顺磁(PM)到反铁磁(AFM)转变,以及在低于奈尔温度 TN 的固定温度下施加强磁场诱导的反铁磁到铁磁(FM)转变。研究发现,在这两种情况下,库仑斥力、自旋轨道耦合和交换相互作用的协同效应决定了晶格对温度和磁场等外部扰动变化的响应。特别是,由于自旋轨道耦合和库仑斥力很强,铁原子和钛原子沿晶格的 c 轴同步移动,因此它们之间的距离变化不到 1%。同时,由于强烈的层内铁磁相互作用,Fe-O-Fe 键角变得更接近 90∘。值得注意的是,温度诱导的 PM 向 AFM 转变过程中发生的运动方向与磁场诱导的 AFM 向 FM 转变过程中发生的运动方向相反。总之,看似简单的 FeTiO3 钛铁矿表现得就像一个复杂的物理系统,其中电荷、自旋、轨道和晶格自由度紧密耦合。我们的发现可能与钛铁矿家族的其他成员以及一般自旋轨道耦合磁绝缘体有关。
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引用次数: 0
Lead-free room-temperature ferroelectric thermal conductivity switch using anisotropies in thermal conductivities 利用热导率各向异性实现无铅室温铁电导热开关
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-05 DOI: 10.1103/physrevmaterials.8.094403
Lucile Féger, Carlos Escorihuela-Sayalero, Jean-Michel Rampnoux, Kyriaki Kontou, Micka Bah, Jorge Íñiguez-González, Claudio Cazorla, Isabelle Monot-Laffez, Sarah Douri, Stéphane Grauby, Riccardo Rurali, Stefan Dilhaire, Séverine Gomès, Guillaume F. Nataf
Materials with on-demand control of thermal conductivity are the prerequisites to build thermal conductivity switches, where the thermal conductivity can be turned on and off. However, the ideal switch, while required to develop novel approaches to solid-state refrigeration, energy harvesting, and even phononic circuits, is still missing. It should consist of an active material only, be environment friendly, and operate near room temperature with a reversible, fast, and large switching ratio. Here, we first predict by ab initio electronic structure calculations that ferroelectric domains in barium titanate exhibit anisotropic thermal conductivities. We confirm this prediction by combining frequency-domain thermoreflectance and scanning thermal microscopy measurements on a single crystal of barium titanate. We then use this gained knowledge to propose a lead-free thermal conductivity switch without inactive material, operating reversibly with an electric field. At room temperature, we find a switching ratio of 1.6±0.3, exceeding the performances of state-of-the-art materials suggested for thermal conductivity switches.
按需控制热导率的材料是制造热导率开关的先决条件,在这种开关中,热导率可以开启或关闭。然而,理想的开关虽然是开发固态制冷、能量收集甚至声波电路的新方法所必需的,但目前仍然缺失。它应该只由活性材料组成,对环境友好,在室温附近工作,具有可逆、快速和大开关比。在这里,我们首先通过ab initio 电子结构计算预测钛酸钡中的铁电畴会表现出各向异性的热导率。通过对钛酸钡单晶体进行频域热反射和扫描热显微镜测量,我们证实了这一预测。然后,我们利用这些知识提出了一种无铅导热开关,它不含非活性材料,在电场作用下可逆运行。在室温下,我们发现开关比为 1.6±0.3,超过了建议用于导热开关的最先进材料的性能。
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引用次数: 0
Phase-separated charge order and twinning across length scales in CsV3Sb5 CsV3Sb5 中跨长度尺度的相分离电荷秩序和孪晶
IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-05 DOI: 10.1103/physrevmaterials.8.093601
Jayden Plumb, Andrea Capa Salinas, Krishnanand Mallayya, Elliot Kisiel, Fellipe B. Carneiro, Reina Gomez, Ganesh Pokharel, Eun-Ah Kim, Suchismita Sarker, Zahirul Islam, Sam Daly, Stephen D. Wilson
We present x-ray scattering studies resolving structural twinning and phase separation in the charge density wave (CDW) state of the kagome superconductor CsV3Sb5. The three-dimensional CDW state in CsV3Sb5 is reported to form a complex superposition of Star of David (SoD) or Tri-Hexagonal (TrH) patterns of distortion within its kagome planes, but the out-of-plane stacking is marked by metastability. To resolve the impact of this metastability, we present reciprocal space mapping and real-space images of CsV3Sb5 collected across multiple length scales using temperature-dependent high-dynamic range mapping (HDRM) and dark-field x-ray microscopy (DFXM). The experimental data provide evidence for a rich microstructure that forms in the CDW state. Data evidence metastability in the formation of 2×2×4 and 2×2×2 CDW supercells dependent on thermal history and mechanical deformation. We further directly resolve the real space phase segregation of both supercells, as well as a real-space, structural twinning driven by the broken rotational symmetry of the CDW state. Our combined results provide insights into the role of microstructure and twinning in experiments probing the electronic properties of CsV3Sb5 where rotational symmetry is broken by the three-dimensional charge density wave order but locally preserved for any single kagome layer.
我们介绍了 X 射线散射研究,该研究解析了可果美超导体 CsV3Sb5 的电荷密度波(CDW)态中的结构孪晶和相分离。据报道,CsV3Sb5 中的三维 CDW 态在其卡戈米平面内形成了复杂的大卫之星(SoD)或三六角形(TrH)畸变图案的叠加,但平面外的堆叠具有易变性。为了解决这种蜕变性的影响,我们利用温度相关的高动态范围绘图(HDRM)和暗视野 X 射线显微镜(DFXM),展示了在多个长度尺度上收集的 CsV3Sb5 的倒易空间绘图和实空间图像。实验数据为在 CDW 状态下形成丰富的微观结构提供了证据。数据证明了 2×2×4 和 2×2×2 CDW 超胞的形成依赖于热历史和机械变形的可转移性。我们进一步直接解析了这两种超胞的实空间相分离,以及由 CDW 状态的断裂旋转对称性驱动的实空间结构孪生。我们的综合结果为探测 CsV3Sb5 电子特性的实验中微观结构和孪晶的作用提供了见解,在 CsV3Sb5 中,旋转对称性被三维电荷密度波序打破,但对于任何单个 kagome 层来说,旋转对称性都是局部保留的。
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Physical Review Materials
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