Superconducting properties of Ca3Ir4Sn13: a μSR study

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Biswas, P.K.^1 ; Amato, A.^1 ; Wang, Kefeng^2 ; Petrovic, C.^2 ; Khasanov, R.^1 ; Luetkens, H.^1 ; Morenzoni, E.^1

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI

CH-5232, Switzerland^1

Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton

NY

11973, United States^2

关键词: Absolute zero temperature;    Magnetic anomalies;    Magnetic penetration depth;    Muon spin relaxation;    Superconducting properties;    Superconducting state;    Temperature dependence;    Zero temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012029/pdf
DOI  :  10.1088/1742-6596/551/1/012029

来源: IOP

【 摘 要 】

Muon spin relaxation and rotation (μSR) measurements have been performed to study the superconducting properties of Ca3Ir4Sn13. Zero-field μSR data shows no sign of any magnetic anomaly in Ca3Ir4Sn13 at the superlattice transition temperature, T∗ or in the superconducting ground state. Transverse-field μSR measurements in the vortex state provided the temperature dependence of the magnetic penetration depth λ. The dependence of λ-2with temperature is consistent with the existence of a single s-wave energy gap in the superconducting state of Ca3Ir4Sn13 with a gap value of 1.51(5) meV at absolute zero temperature. The magnetic penetration depth at zero temperature λ(0) is 351(4) nm. The ratio Δ(0)/kBTc 2.41(8) indicates that Ca3Ir4Sn13 is a strong-coupling superconductor.