Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions,Annalen Der Physik

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Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-08-20 , DOI: 10.1002/andp.202000248
Elena Gati _{1,

2} , Li Xiang _{1,

2} , Sergey L. Bud'ko _{1,

2} , Paul C. Canfield _{1,

2}

Affiliation

Iron‐based superconductors are well‐known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic, and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal‐to‐orthorhombic and a collapsed‐tetragonal transition. In particular, the widely observed tetragonal‐to‐orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to as nematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). Efforts to probe the phase diagrams of pressure‐tuned iron‐based superconductors are reviewed with a strong focus on recent insights into the phase diagrams of several members of this material class under hydrostatic pressure. These studies on FeSe, Ba(Fe

_{1 - x}

Co_x)₂As₂, Ca(Fe

_{1 - x}

Co_x)₂As₂, and CaK(Fe

_{1 - x}

Ni_x)₄As₄ are, to a significant extent, made possible by advances of what measurements can be adapted to their use under differing pressure environments. The potential impact of these tools for the study of the wider class of strongly correlated electron systems is pointed out.

中文翻译：

铁基超导体的静压和单轴压力调谐：对超导性，磁性，向列性和塌陷的四方转变的见解

铁基超导体以其有趣的相图而闻名，这些相图表现出电子，磁性和结构自由度之间复杂的相互作用。在观察到的相变中，有超导，磁性和几种类型的结构转变，包括四方到正交的过渡和塌方的四方过渡。特别是，人们广泛观察到的四方到正交的跃迁被认为是与晶格耦合的电子阶的结果，因此被称为向列跃迁。因此，向列性是这些材料的显着特征，这表明电子和晶格性质耦合的重要性。相应地，这些系统特别容易通过压力（静液压，单轴或某种组合）进行调节。审查了探索压力调谐铁基超导体相图的工作，并着重关注对流体静压下该材料类别的几种成员的相图的最新见解。这些关于FeSe，Ba（Fe