Multiband superconductivity in Ta4Pd3Te16 with anisotropic gap structure

Abstract

We carried out measurements of the magnetoresistance, magnetic susceptibility and specific heat on crystals of the low-dimensional transition metal telluride Ta4Pd3Te16. Our results indicate that Ta4Pd3Te16 is an anisotropic type-II superconductor in the clean limit with the extracted Ginzburg–Landau parameter 84. The upper critical field Hc2(T) shows an anomalous temperature dependence at low temperatures and the anisotropy of Hc2(T) is strongly T-dependent, both of which indicate a multiband scenario. The electronic specific heat (T) can be consistently described by a two-gap (s + d waves) model from the base temperature up to . Our results suggest nodal and multiband superconductivity in Ta4Pd3Te16.