Pressure-dependent electronic superlattice in the Kagome-superconductor CsV_3Sb_5
arxiv(2024)
摘要
We present a high-resolution single crystal x-ray diffraction study of Kagome
superconductor , exploring its response to variations in pressure and
temperature. We discover that at low temperatures, the structural modulations
of the electronic superlattice, commonly associated with charge density wave
order, undergo a transformation around p ∼ 0.7 GPa from the familiar
2×2 pattern to a long-range ordered modulation at wavevector q=(0, 3/8,
1/2). Our observations align with inferred changes in the CDW pattern from
prior transport and nuclear magnetic resonance studies, providing new insights
into these transitions. Interestingly, the pressure-induced variations in the
electronic superlattice correlate with two peaks in the superconducting
transition temperature as pressure changes, hinting that fluctuations within
the electronic superlattice could be key to stabilizing superconductivity.
However, our findings contrast with the minimal pressure dependency anticipated
by ab initio calculations of the electronic structure. They also challenge
prevailing scenarios based on a Peierls-like nesting mechanism involving van
Hove singularities.
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