Abstract
We have performed muon spin rotation/relaxation and 119Sn nuclear magnetic resonance (NMR) measurements to study the vortex state of polycrystalline samples of YPd2Sn (Tc = 5.4 K), over a wide range of applied magnetic fields up to Bc2(T). Measurements in the vortex state provide the temperature dependence of the effective magnetic penetration depth λ(T) and the field dependence of the superconducting gap Δ(0). The results are consistent with a very dirty s-wave BCS superconductor with λ(0) = 212(1) nm, a gap Δ(0) = 0.85(3) meV, and a Ginzburg-Landau coherence length ξGL(0) ≊ 23 nm. The μSR data in a broad range of applied fields are well reproduced by taking into account a field-related reduction of the effective superconducting gap. Interestingly, the ratio 2Δ(0)/(kBTc) appears to a good approximation to be field-independent, with a value at low field of 3.85(9), implying a field dependence of the gap . We discuss the significance of this result.
Highlights
The compound YPd2Sn is a so-called full Heusler compound with general formula AT2M (M main group element, T transition element, and A either a rare earth or another transition element)
The low Bc2(0) = 0.57 T of this material allowed to study the B − T phase diagram in the vortex state over a large range of fields up to the phase boundary and to investigate how the BCS gap is affected by a large magnetic field
The field dependence of the critical temperature obtained in such a way is in good agreement with the Bc2(T ) curve obtained from magnetoresistivity and ac magnetization measurements and is well reproduced by the prediction of the Werthamer-Helfand-Hohenberg (WHH) expression [7]
Summary
The compound YPd2Sn is a so-called full Heusler compound with general formula AT2M (M main group element, T transition element, and A either a rare earth or another transition element). We focus on investigations of the vortex state and we discuss the possible field dependence of the energy gap in a conventional BCS superconductor.
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