Specific heat of robust Nb2PdS5 superconductor

TL;DR

This study investigates the specific heat properties of the Nb2PdS5 superconductor, revealing its robustness against magnetic fields, multiband s-wave superconductivity, and an upper critical field exceeding the Pauli limit.

Contribution

The paper provides detailed heat capacity measurements under magnetic fields, demonstrating Nb2PdS5 as a multiband superconductor with a high upper critical field surpassing the Pauli limit.

Findings

Nb2PdS5 is superconducting below 6 K.

Upper critical field exceeds the Pauli limit at 190 kOe.

Evidence of multiband s-wave superconductivity.

Abstract

We report specific heat under different magnetic fields for recently discovered quasi-one dimensional Nb2PdS5 superconductor. The studied compound is superconducting below 6 K. Nb2PdS5 is quite robust against magnetic field with dHc/dT of -42 kOe/K. The estimated upper critical field [Hc2(0)] is 190 kOe, clearly surpassing the Pauli-paramagnetic limit of 1.84Tc. Low temperature heat capacity in superconducting state of Nb2PdS5 under different magnetic fields showed s-wave superconductivity with two different gaps. Two quasi-linear slopes in Somerfield-coefficient as a function of applied magnetic field and two band behavior of the electronic heat capacity demonstrate that Nb2PdS5 is a multiband su-perconductor in weak coupling limit with deltagamma/deltaTc=0.9.