Andreev reflection in the enhanced superconducting phase of Cu0.04PdTe2

Abstract

A unique superconducting phase where type I and type II superconductivity coexist was seen below 1.7 K in the Dirac semimetal PdTe. The mixed superconducting phase was attributed to the local variation of the Ginzburg–Landau parameter() in PdTe. In such a scenario, it is imperative that introduction of disorder would make the system homogeneously type II. Here, we report our study of Point contact Andreev Reflection Spectroscopy on the 4% Cu intercalated PdTe single crystals. Cu-intercalates help enhance the critical temperature by donating carriers to the system, and at the same time act as scattering centres thereby reducing the effective . Our detailed magnetic field dependent point contact spectroscopy studies show a typical type-II behaviour in Cu-PdTe. A conventional BTK analysis of the spectra revealed a BCS-like gap = 330. With , Cu-PdTe falls in the strong coupling regime.