Phys.org July 5, 2021
To study the layered cage structure superconductor CsV3Sb5, which has a charge density wave (CDW) transition temperature of 94 K, researchers in China conducted high-pressure electrical transport and magnetic susceptibility measurements. They found that the CDW transition is monotonically suppressed by pressure, and superconductivity is enhanced with increasing pressure up to P1 ≈ 0.7 GPa. They found an unexpected suppression of superconductivity until pressure around 1.1 GPa, after that, Tc was enhanced with increasing pressure again. The CDW was completely suppressed at a critical pressure P2 ≈ 2 GPa together with a maximum Tc of about 8 K. The pressure-dependent Tc showed an unexpected double-peak behavior. The unusual suppression of Tc at P1 was concomitant with the rapidly damping of quantum oscillations, sudden enhancement of the residual resistivity and rapid decrease of magnetoresistance. The study showed an unusual competition between superconductivity and CDW in CsV3Sb5, which provides experimental clues for studying the unconventional CDW mechanism…read more.
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Credit: Nature Communications volume 12, Article number: 3645 (2021) Temperature dependence of resistivity in CsV3Sb5 single crystals under high pressure.