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- W3188931940 abstract "The effects of structural quantum criticality on the strong-coupling superconductivity of (Sr$_{1-x}$Ca$_x$)$_3$Rh$_4$Sn$_{13}$ have been investigated via electrical resistivity and specific heat measurements. We demonstrate that the lattice specific heat at low temperatures considerably increases toward the structural quantum critical point (SQCP), $x_{rm c}approx0.9$. The superconducting gap increases with $x$ in the exact same fashion as the low-temperature lattice specific heat, clearly indicating that the abundant low-energy phonons cause strong-coupling superconductivity. Despite the electron-phonon interaction, which is much more enhanced than the electron correlation, the low-temperature electrical resistivity near the SQCP varies as $propto T^2$. This finding suggests that structural quantum fluctuation affects the power law arising from the electron-phonon scattering." @default.
- W3188931940 created "2021-08-16" @default.
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- W3188931940 date "2021-08-01" @default.
- W3188931940 modified "2023-09-27" @default.
- W3188931940 title "Superconductivity enhanced by abundant low-energy phonons in (Sr$_{1-x}$Ca$_x$)$_3$Rh$_4$Sn$_{13}$" @default.
- W3188931940 doi "https://doi.org/10.48550/arxiv.2108.00434" @default.
- W3188931940 hasPublicationYear "2021" @default.
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