Superconducting gap of the single crystal β-PdBi2

29th International Symposium on Superconductivity

Matsuzaki, H.^1 ; Nagai, K.^2 ; Kase, N.^1 ; Nakano, T.^1 ; Takeda, N.^2

Graduate School of Science and Technology, Niigata University, Niigata

950-2102, Japan^1

Department of Materials Science and Technology, Niigata University, Niigata

950-2102, Japan^2

关键词: Electronic specific heat;    Gap symmetry;    Normal properties;    Residual resistivity ratios;    Strong coupling;    Superconducting gaps;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012004/pdf
DOI  :  10.1088/1742-6596/871/1/012004

来源: IOP

【 摘 要 】

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 Hc2curve 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.