Y. Liu, Y. J. Long, L. X. Zhao, S. M. Nie, S. J. Zhang, Y. X. Weng, M. L. Jin, W. M. Li, Q. Q. Liu, Y. W. Long, R. C. Yu, X. L. Fen, Q. Li, H. M. Weng, X. Dai, … 展开作者
Y. Liu, Y. J. Long, L. X. Zhao, S. M. Nie, S. J. Zhang, Y. X. Weng, M. L. Jin, W. M. Li, Q. Q. Liu, Y. W. Long, R. C. Yu, X. L. Fen, Q. Li, H. M. Weng, X. Dai, Z. Fang, G. F. Chen, C. Q. Jin
Recently, ZrTe5 and HfTe5 are theoretically studied to be the most promising layered topological insulators since they are both interlayer weakly bonded materials and also with a large bulk gap in the single layer. It paves a new way for the study of novel topological quantum phenomenon tuned via external parameters. Here, we report the discovery of superconductivity and properties evolution in HfTe5 single crystal induced via pressures. Our experiments indicated that anomaly resistance peak moves to low temperature first before reverses to high temperature followed by disappearance which is opposite to the low pressure effect on ZrTe5. HfTe5 became superconductive above ~5.5 GPa up to at least 35 GPa in the measured range. The highest superconducting transition temperature (Tc) around 5 K was achieved at 20 GPa. High pressure Raman revealed that new modes appeared around pressure where superconductivity occurs. Crystal structure studies shown that the superconductivity is related to the phase transition from Cmcm structure to monoclinic C2/m structure. The second phase transition from C2/m to P-1 structure occurs at 12 GPa. The combination of transport, structure measurement and theoretical calculations enable a completely phase diagram of HfTe5 at high pressures.
Short commentary on comparing previous claim of RT superconductivity with the data of arXiv:1807.08572, "Evidence for Superconductivity at Ambient Temperature and Pressure in Nanostructures"
Hydrostatic pressure study of the structural phase transitions and superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x = 0 and 0.45) and CaFe2As2
Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR study under hydrostatic pressure
Superconductivity at 33 K in "111" single crystals at ambient pressure
我们已经成功地生长了单晶NaFeAs与钴或磷掺杂。在19 K时NaFe $_{0.95}$ Co $_{0.05}$ As中出现体超导电性，而在NaFeAs $_{0.8}$ P $_{0.2}$中观察到更高的转变温度，其中33 K的Tc甚至高于NaFeAs和所有其他等电子元素替代样品中通过施加压力实现的最高值。我们通过与122和1111系统的比较来讨论这些行为。我们希望我们的发现将有助于提高我们对铁基超导性的理解。
Pressure-induced phase transition and superconductivity in YBa2Cu4O8
利用Raman光谱和从头计算方法研究了欠掺杂、化学计量比的高温超导体YBa_2Cu_4O_8的晶格动力学随压力和温度的变化。该系统经历了一个可逆的压力引起的结构相变约10 GPa的崩溃的正交结构，这是很好地再现的计算。类B1g屈曲声子模与电子连续谱的耦合被用来探测超导性。在低压阶段，通过超导跃迁的自能效应使该声子重整化，并且该重整化的幅度随着压力而强烈增加。而我们的计算表明，这种模式的耦合到电子系统的结构相变的影响很小，上述重整化是完全抑制在高压相，表明在流体静压力高于10 GPa，超导性在YBa 2 Cu 4 O 8大大削弱或抹杀。
Gigantic anisotropic uniaxial pressure effect on superconductivity within the CuO2 plane of La1.64Eu0.2Sr0.16CuO4 - strain control of stripe criticality
Pressure-induced superconductivity beyond magnetic quantum criticality in a Kondo ferromagnet
New Cornerstone Science Laboratory, Center for Correlated Matter and School of Physics, Zhejiang University（浙江大学物理学院关联物质中心新基石科学实验室）；Hubei Key Laboratory of Photoelectric Materials and Devices, School of Materials Science and Engineering, Hubei Normal University（湖北师范大学材料科学与工程学院光电材料与器件湖北省重点实验室）
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。
Effect of Hydrostatic Pressure on the Superconductivity in NaxCoO2.yH2O
The effect of hydrostatic pressure on the superconducting transition temperature of Na{0.35}CoO{2}.yH{2}O was investigated by ac susceptibility measurements up to 1.6 GPa. The pressure coefficient of T{c} is negative and the dependence T{c}(p) is nonlinear over the pressure range investigated. The magnitude of the average dlnT{c}/dp=-0.07 GPa^{-1} is comparable to the pressure coefficient of electron-doped high-T{c} copper oxide superconductors with a similar value of T{c}. Our results provide support to the assumption of two-dimensional superconductivity in Na{0.35}CoO{2}.yH{2}O, which is sim…
Unconventional superconductivity emerging along with the strange-metal behavior in UAs2 under pressure
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系，先进微结构协同创新中心）；College of Advanced Interdisciplinary Studies & Nanhu Laser Laboratory, National University of Defense Technology（国防科技大学高级跨学科研究院与南湖激光实验室）
Superconductivity of Cs$_3$C$_{60}$ at atmosphere pressure
压力作为一种清洁、高效的工具，能使物质产生意想不到的非凡物理化学性质。最近发现的超导性在近室温下的超导性在这方面突出了压力的力量。在大气压下捕获这种Tc超导性用于技术应用是非常期望的。通过化学气相沉积法在远离通常的高压和高温条件下大规模生长金刚石，为这种希望提供了燃料。与MgB类似，Cs掺杂的C $_{60}$也被发现通过施加与MgB $_2$相当的Tc为40 K的压力而表现出超导性。在这里，我们报告的成功实现的超导电性铯掺杂的C $_{60}$在大气压力。该相具有原始立方结构，空间群为Pa-3，化学计量比为Cs $_3$ C $_{60}$。超导电性从迈斯纳效应和零电阻态的观察中得到了证实。虽然压力对新发现的Cs $_{3}$ C $_{60}$超导体的超导性的影响与已知的fcc和A15结构的两相超导体不同，但所有这些超导体的Tc随体积的演变遵循相同的普遍趋势，表明相同的超导配对机制。这种趋势与具有较小晶胞体积的结构中的Tc与晶格常数的近似线性关系以及具有较大晶胞体积的结构中的相邻反铁磁态一起引起电子-声子耦合和电子关联一起解释Cs $_3$ C $_{60}$的超导性。目前的结果和发现表明，一个新的路线捕捉超导发生在高压到大气压环境。
