Two types of charge order with distinct interplay with superconductivity in the kagome material CsV3Sb5
Two types of charge order with distinct interplay with superconductivity in the kagome material CsV3Sb5
复制标题
kagome材料CsV3Sb5中两种不同类型的电荷顺序与超导性的相互作用
DOI：
10.1038/s42005-022-01011-0
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发表时间：
2022-09-21
影响因子：
5.5
通讯作者：
Khasanov, Rustem
中科院分区：
文献类型：
--
作者：
Gupta, Ritu;Das, Debarchan;Khasanov, Rustem
AV(3)Sb(5)族戈薇金属具有独特的结构图案，具有一系列有趣的现象，例如手性电荷有序性和超导性。 CsV3Sb5 特别令人感兴趣，因为它在温度-压力相图区域中显示出双超导圆顶，其中电荷顺序仍然存在。然而，这种不寻常行为的微观起源仍然是一个未解决的问题。在这里，为了解决这个问题，我们将高压、低温μ子自旋弛豫/旋转与第一原理计算结合起来。我们观察到压力引起的超流体密度增加了三倍，这也表现出双峰特征，类似于超导临界温度。这导致相图中出现三个不同的区域，每个区域都具有超流体密度与临界温度之间线性关系的不同斜率。这些结果归因于电荷有序模式从低压下（第一个圆顶内）叠加的三六方大卫相到中压下（第一和第二圆顶之间）交错三六方相的可能演变。我们的研究结果表明，CsV3Sb5 相图中电荷有序态的性质发生了变化，与超导性存在不同程度的竞争。Kagome 金属可以容纳竞争现象的复杂相互作用，并且对如何设计所得特性以及理解基础物理进行了大量研究。在这里，作者结合高压和μ子自旋旋转测量研究了 CsV3Sb5 的电荷密度波序与超导性之间的竞争。
The kagome metals of the family AV(3)Sb(5), featuring a unique structural motif, harbor an array of intriguing phenomena such as chiral charge order and superconductivity. CsV3Sb5 is of particular interest because it displays a double superconducting dome in the region of the temperature-pressure phase diagram where charge order is still present. However, the microscopic origin of such an unusual behavior remains an unsolved issue. Here, to address it, we combine high-pressure, low-temperature muon spin relaxation/rotation with first-principles calculations. We observe a pressure-induced threefold enhancement of the superfluid density, which also displays a double-peak feature, similar to the superconducting critical temperature. This leads to three distinct regions in the phase diagram, each of which features distinct slopes of the linear relation between superfluid density and the critical temperature. These results are attributed to a possible evolution of the charge order pattern from the superimposed tri-hexagonal Star-of-David phase at low pressures (within the first dome) to the staggered tri-hexagonal phase at intermediate pressures (between the first and second domes). Our findings suggest a change in the nature of the charge-ordered state across the phase diagram of CsV3Sb5, with varying degrees of competition with superconductivity.Kagome metals can house a complex interplay of competing phenomenon and there has been significant investigation into how to engineer the resultant properties, as well as understand the underlying physics. Here, the authors investigate the competition between charge density wave order and superconductivity for CsV3Sb5 using a combination of high-pressure and muon spin rotation measurements.