Isotropic s-wave superconductivity in the noncentrosymmetric charge density wave superconductor SrPt2As2
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2020-10-19
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Journal Article
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Abstract
SrPt2As2 undergoes a structural transition around 470 K (from a high-temperature tetragonal to a low-temperature orthorhombic phase) accompanied by a charge density wave transition and followed by a superconducting transition at much lower temperature (5 K). The superconducting gap symmetry of this noncentrosymmetric compound was investigated in detail by means of muon-spin rotation or relaxation (mu SR) experiments in transverse-field (TF) configuration. The temperature-dependent magnetic penetration depth obtained from the TF-mu SR spectra suggests an isotropic s-wave-type superconducting gap. No observable differences are seen in the asymmetry time spectra collected in zero field above and below the superconducting transition temperature T-c. This strongly suggests the absence of spontaneous magnetic fields in the superconducting state, hence pointing to a preserved time-reversal symmetry below T-c.
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102 (14)
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144515
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American Physical Society
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169455 - Exotic matter and correlated quantum phenomena (SNF)