Microscopic studies of the normal and superconducting state of Ca3Ir4Sn13

Article

关键词: MU-SR;   

DOI  :  10.1103/PhysRevB.88.104505

来源: SCIE

【 摘 要 】

We report on muon spin rotation (mu SR) studies of the superconducting and magnetic properties of the ternary intermetallic stannide Ca3Ir4Sn13. This material has recently been the focus of intense research activity due to a proposed interplay of ferromagnetic spin fluctuations and superconductivity. In the temperature range T = 1.6-200 K, we find that the zero-field muon relaxation rate is very low and does not provide evidence for spin fluctuations on the mu SR time scale. The field-induced magnetization cannot be attributed to localized magnetic moments. In particular, our mu SR data reveal that the anomaly observed in thermal and transport properties at T* approximate to 38 K is not of magnetic origin. Results for the transverse-field muon relaxation rate at T = 0.02-12 K suggest that superconductivity emerges out of a normal state that is not of a Fermi-liquid type. This is unusual for an electronic system lacking partially filled f-electron shells. The superconducting state is dominated by a nodeless order parameter with a London penetration depth of lambda(L) = 385(1) nm and the electron-phonon pairing interaction is in the strong-coupling limit.

【 授权许可】

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