Abstract
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−2 with 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.
Highlights
The ternary intermetallic stannide compounds, M 3Ir4Sn13, where M = Ca, Sr, etc. are of particular interest because they exhibit many exotic physical properties such as superconductivity, magnetic or charge order, and structural instabilities [3, 4, 5]
The claim was made with the observation that the resistivity follows a non-Fermi liquid temperature dependence, but that the Fermi liquid behaviour can be restored by applying a high magnetic field [3]
We can determine the second moment of the magnetic field distribution associated with the vortex state from the TF-μSR spectra
Summary
Ca3Ir4Sn13 one of the most important material among these compounds shows a superconducting ground state below 7 K [1, 2]. The claim was made with the observation that the resistivity follows a non-Fermi liquid temperature dependence, but that the Fermi liquid behaviour can be restored by applying a high magnetic field [3]. Recent μSR study on Ca3Ir4Sn13 [7] determined a very high gap-to-Tc ratio value ∆(0)/(kBTc) = 5, which is unusually large even for a very strongly coupled BCS superconductor.
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