π Phase Interlayer Shift and Stacking Fault in the Kagome Superconductor CsV3Sb5
Feng Jin, Wei Ren, Mingshu Tan, Mingtai Xie, Bingru Lu, Zheng Zhang, Jianting Ji, Qingming Zhang
DOI 10.1103/PhysRevLett.132.066501 · Physical Review Letters
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Abstract
The stacking degree of freedom is a crucial factor in tuning material properties and has been extensively investigated in layered materials. The kagome superconductor CsV3Sb5 was recently discovered to exhibit a three-dimensional CDW phase below TCDW∼94 K. Despite the thorough investigation of in-plane modulation, the out-of-plane modulation has remained ambiguous. Here, our polarization- and temperature-dependent Raman measurements reveal the breaking of C6 rotational symmetry and the presence of three distinct domains oriented at approximately 120° to each other. The observations demonstrate that the CDW phase can be naturally explained as a 2c staggered order phase with adjacent layers exhibiting a relative π phase shift. Further, we discover a first-order structural phase transition at approximately 65 K and suggest that it is a stacking order-disorder phase transition due to stacking fault, supported by the thermal hysteresis behavior of a Cs-related phonon mode. Our findings highlight the significance of the stacking degree of freedom in CsV3Sb5 and offer structural insights to comprehend the entanglement between superconductivity and CDW.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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