We have investigated structural and magnetic phase transitions under high pressures in a quaternary rare earth transition metal arsenide oxide NdCoAsO compound that is isostructural to high temperature superconductor NdFeAsO. Four-probe electrical resistance measurements carried out in a designer diamond anvil cell show that the ferromagnetic Curie temperature and anti-ferromagnetic Neel temperature increase with an increase in pressure. High pressure x-ray diffraction studies using a synchrotron source show a structural phase transition from a tetragonal phase to a new crystallographic phase at a pressure of 23 GPa at 300 K. The NdCoAsO sample remained anti-ferromagnetic and non-superconducting to temperatures down to 10 K and to the highest pressure achieved in this experiment of 53 GPa. A P-T phase diagram for NdCoAsO is presented to a pressure of 53 GPa and low temperatures of 10 K.
Pressure-induced Topological and Structural Phase Transitions in an Antiferromagnetic Topological Insulator
最近,自然范德华异质结构的(MnBi 2 Te 4)m(Bi 2 Te 3)n已被理论预测和实验表明主机可调的磁性和拓扑非平凡的表面状态。在这项工作中,我们系统地研究了MnBi_2Te_4和MnBi_4Te_7对外压的结构和电子响应。除了抑制反铁磁秩序,MnBi 2 Te 4被发现进行金属-半导体-金属的转变时压缩。MnBi_4 Te_7的电阻率在高压下发生了剧烈的变化,并观察到\r{ho}(T)的非单调演化。非平凡的拓扑结构被证明是持久的结构相变之前观察到的高压制度。我们发现,体态和表面态对压力的响应不同,这与电阻率的非单调变化是一致的。有趣的是,在MnBi 2 Te 4中观察到压力诱导的非晶态,而在MnBi 4 Te 7中揭示了两个高压相变。我们的理论和实验研究相结合,建立了MnBi 2 Te 4和MnBi 4 Te 7作为高度可调的磁性拓扑绝缘体,其中相变和新的基态出现压缩。
In-Plane Ni-O-Ni Bond Angles as Structural Fingerprints of Superconductivity in Layered Nickelates: Effects of Pressure, Strain, Layering, and Correlations
Pressure-induced structural transition, metallization, and topological superconductivity in PdSSe
Guilin University of Technology(桂林理工大学);Wuhan University(武汉大学);Beihang University(北京航空航天大学);Institute of Physics, Polish Academy of Sciences(波兰科学院物理研究所);Chinese Academy of Sciences(中国科学院);University of Chinese Academy of Sciences(中国科学院大学)
Effect of pressure on the structural phase transition and superconductivity in (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$ ($x = 0$ and 0.45) single crystals
本文研究了压力对轻掺Sn的BaFe $\sim 20$ As $_2$的结构相变以及(Ba $_{0.55}$ K $_{0.45}$)Fe $_2$ As $_2$单晶的超导转变温度和上临界场的影响。这两种转变都以几乎线性的方式随压力而减小。在压力下,上临界场曲线$H_{c2}(T)$在温度下向下移动,以跟随零场$T_c$,斜率变化很小。
Structural responses incipient to pressure-driven antiferromagnetic quantum critical point of van der Waals heavy-fermion metal CeSiI
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology(华中科技大学物理学院);School of Physics and Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China(中国人民大学物理学院);Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo(东京大学前沿科学研究生院先进材料科学系);Department of Natural Sciences, Faculty of Science and Engineering, Tokyo City University(东京都市大学理工学部自然科学科)
Coupled structural and electronic evolution under pressure in CuIr2Se4, CuRh2S4, and CuRh2Se4
Nagoya University(名古屋大学);Okayama University(冈山大学);The Institute for Solid State Physics, The University of Tokyo(东京大学固体物理研究所);Kitasato University(北里大学);The University of Electro-Communications(电气通信大学);Japan Synchrotron Radiation Research Institute (JASRI)(日本同步辐射研究机构(JASRI));Kyoto University(京都大学)
Competition between the structural phase transition and superconductivity in Ir$_{1-x}$Pt$_x$Te$_2$ as revealed by pressure effects
报道了Ir $_{1-x}$ Pt $_x$ Te $_2$的压力依赖输运测量结果。随着压力的增加,高温下的结构相变增强,而低温下的超导转变被抑制。这些压力效应使Ir $_{1-x}$ Pt $_x$ Te $_2$不同于其他研究的$T$ X $_2$系统,表现出电荷密度波(CDW)状态,其中压力通常抑制CDW状态并增强超导状态。结果表明,在Ir $_{1-x}$ Pt $_x$ Te $_2$中,超导电性的出现与低温单斜相的稳定性竞争。
Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals
本文研究了高压对SrFe $\sim 20$ As $_2$和轻掺Sn的BaFe $_2$ As $_2$结构相变以及(Ba $_{0.55}$ K $_{0.45}$)Fe $_2$ As $_2$单晶超导转变温度和上临界场的影响。所有的转变温度随压力几乎呈线性下降。在压力下,(Ba $_{0.55}$ K $_{0.45}$)Fe $_2$的上临界场曲线$H_{c2}(T)$随着温度下降而跟随零场$T_c$,斜率变化很小。复合$P - T$相图的三个母体化合物,AFe $_2$作为$_2$(A = Ba,Sr,Ca),构建和似乎是非常相似的:(i)具有结构(反铁磁)相变线与负斜率和(ii)显示出新兴的超导状态的迹象,在中压。
Pressure-induced Structural Phase Transition, Metallization, and Superconductivity in layered metalloid dichalcogenide 1T-SiTe$_2$
National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University(南京大学固体微结构物理国家重点实验室和物理学院,先进微结构协同创新中心)
Impact of Uniaxial Pressure on Structural and Magnetic Phase Transitions in Electron-Doped Iron Pnictides
利用中子共振自旋回波和拉莫尔衍射研究了单轴压力对铁磷属元素化物BaFe $_{2-x}$ Ni $_{x}$ As $_{2}$($x=0,0.03,0.12$)、SrFe $_{1.97}$ Ni $_{0.03}$ As $_2$和BaFe $_2$(As $_{0.7}$ P $_{0.3}$)$_2$的四方-正交结构($T_s$)和反铁磁(AF)相变的影响.在反铁磁有序的BaFe $_{2-x}$ Ni $_{x}$ As $_{2}$和SrFe $_{1.97}$ Ni $_{0.03}$ As $_2$ with $T_N$和$T_s$($T_N\leq T_s$)中,样品去孪晶所需的单轴压力也会增加$T_N$,消除结构转变,并在所有温度下引起正交晶格畸变。通过比较压力引起的晶格参数变化的温度和掺杂依赖性与从输运和超声测量获得的弹性电阻和极化率,我们的结论是,在电子欠掺杂铁磷属元素化物的顺磁状态中发现的平面电阻率各向异性敏感地取决于磁相变的性质以及单轴压力引起的晶格畸变和电子抗氧化敏感性
Suppression of superconductivity and structural phase transition against pressure in Ca$_{10}$(Ir$_{4}$As$_{8}$)(Fe$_{2-x}$Ir$_{x}$As$_{2}$)$_{5}$
我们测量了最近发现的铁基超导体Ca $_{10}$的面内电阻率$ρ_{ab}$的压力依赖性(Ir $_{4}$ As $_{8}$)(Fe $_{2-x}$ Ir $_{x}$ As $_{2}$)$_{5}$,其在没有磁有序的情况下显示出独特的结构相变,在环境压力下,超导转变温度$T_{\rm c}$ = 16 K,结构相变温度$T_{\rm s}$ $\simeq$ 100 K。$T_{\rm c}$和$T_{\rm s}$在施加压力时受到抑制,并在约0.5 GPa时消失,表明超导性与结构之间的关系。Ca $_{10}$(Ir $_{4}$ As $_{8}$)(Fe $_{2-x}$ Ir $_{x}$ As $_{2}$)$_{5}$是一个相当罕见的例子,其中超导性只出现在低温有序相中。晶体结构的变化与超导电性直接相关的事实表明,晶体结构和磁性是控制铁磷属元素化物超导电性的重要因素。
Pressure-induced superconductivity and structural transition in ferromagnetic Cr2Si2Te6
原子薄的二维过渡金属三硫族化合物的内禀磁性的发现,由于其奇异的磁性和在器件中的潜在应用,引起了人们极大的研究兴趣。压力已被证明是操纵材料的晶体和电子结构的有效工具。在这里,我们报告调查铁磁范德华Cr2 Si 2 Te 6通过高压同步辐射X射线衍射,电阻,霍尔电阻和磁阻测量。在压缩条件下,Cr2 Si 2 Te 6同时发生结构转变,在3 K出现超导电性,磁电阻符号发生变化,在~8 GPa时霍尔系数发生剧烈变化。超导性持续到最高测量压力47.1 GPa,在~30 GPa时最大Tc = 4.5 K。二维范德华铁磁Cr基Cr2 Si 2 Te 6超导性的发现为研究超导性以及超导性与磁性的相互作用提供了新的视角。
Hydrostatic pressure study of the structural phase transitions and superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x = 0 and 0.45) and CaFe2As2
Single-crystal structural phase diagram of stoichiometric bilayer nickelate La3Ni2O7 under hydrostatic pressure
The University of Tokyo(东京大学);RIKEN Center for Emergent Matter Science (CEMS)(理化学研究所 新兴物质科学中心);Tohoku University(东北大学);Japan Synchrotron Radiation Research Institute (JASRI)(日本同步辐射研究所);Tokyo College, The University of Tokyo(东京大学东京学院);Institute of Engineering Innovation, The University of Tokyo(东京大学工程创新研究所);RIKEN Pioneering Research Institute (PRI)(理化学研究所 先驱研究 institute)
Pressure-Driven Structural Transitions without a Displacive Charge-Density Wave in La$_2$SmNi$_2$O$_7$
Université Paris-Saclay(巴黎萨克雷大学);CNRS, Laboratoire de Physique des Solides(法国国家科学研究中心,固体物理实验室);Synchrotron SOLEIL(索雷尔同步辐射中心);CNRS, Université Grenoble Alpes, Institut Néel(法国国家科学研究中心,格勒诺布尔阿尔卑斯大学,奈耳研究所);Institut universitaire de France (IUF)(法国高等研究院);Institut de Chimie de la matière condensée de Bordeaux, Université Bordeaux(波尔多物质化学研究所,波尔多大学);Thapar Institute of Engineering and Technology(塔帕工程技术学院)