Superconducting gap of the single crystal β-PdBi2

Abstract

We investigate superconducting and normal properties of the single crystal of β-PdBi2. The electrical resistivity ρ(T) shows superconductivity at Tc = 5.0 K. Residual resistivity ratio (RRR) is estimated to be 2.9 obtained from ρ(300 K)/ρ(5.0 K). The Hc2 curve obtained from ρ(T) in magnetic fields shows cleat enhancement from the Wertharmer-Helfand-Hohenberg theory in dirty limit. Specific heat C(T) measurement shows that clear jump is observed at Tc = 4.8 K. T-dependence of the electronic specific heat Ce(T) suggests full-gap symmetry with a single gap and strong coupling with ΔCe/γTc = 1.8.