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We study the coexistence of superconductivity (SC) and density-wave state and reconcile various puzzling experimental data in organic superconductors ${(\mathrm{TMTSF})}_{2}{\mathrm{PF}}_{6}$ and ${(\mathrm{TMTSF})}_{2}{\mathrm{ClO}}_{4}$. The anisotropic resistance drop above ${T}_{c}$ is qualitatively… Click to show full abstract
We study the coexistence of superconductivity (SC) and density-wave state and reconcile various puzzling experimental data in organic superconductors ${(\mathrm{TMTSF})}_{2}{\mathrm{PF}}_{6}$ and ${(\mathrm{TMTSF})}_{2}{\mathrm{ClO}}_{4}$. The anisotropic resistance drop above ${T}_{c}$ is qualitatively described by nascent isolated SC islands within a bulk analytical model. However, the observed anisotropic SC onset is explained only when the finite size and flat needle shape of samples is considered. Our results pave a way to estimate the volume fraction and the typical size of SC islands far from the sample surface and apply to many inhomogeneous superconductors, including high-${T}_{c}$ cuprate or Fe-based ones.
Journal Title: Physical Review B
Year Published: 2021
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