SrPt${}_3$P: two-band single-gap superconductor

Abstract

The magnetic penetration depth ($\lambda$) as a function of applied magnetic field and temperature in SrPt${}_3$P($T_c\simeq 8.4$ K) was studied by means of muon-spin rotation ($\mu$SR). The dependence of ${\lambda }^{-2}$ on temperature suggests the existence of a single $s-$wave energy gap with the zero-temperature value $\Delta =1.58(2)$ meV. At the same time $\lambda$ was found to be strongly field dependent which is the characteristic feature of the nodal gap and/or multi-gap systems. The multi-gap nature of the superconduicting state is further confirmed by observation of an upward curvature of the upper critical field. This apparent contradiction would be resolved with SrPt${}_3$P being a two-band superconductor with equal gaps but different coherence lengths within the two Fermi surface sheets.

6 pages, 4 figures

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