Electronic Structure and Upper Critical Field of Superconducting Ta$_2$PdS$_5$

We report electronic structure calculations for Ta$_2$PdS$_5$, which is a layered superconductor containing heavy elements and displaying an upper critical field, $H_{c2}(0)$, $\sim$3 times higher than the estimated Pauli limit. We show that this is a multiband superconductor that is most likely in the strong coupling regime. This provides an alternative explanation to strong spin orbit scattering for the high upper critical field.

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