Speaker
Description
The search of new classes of materials where superconductivity (SC) coexists with other exotic nonmagnetic phases is crucial to understand the influence of the latter on SC. Here, we present a detailed investigation of the superconducting gap symmetry on a charge-density-wave (CDW) superconductor SrPt2As2 by means of muon-spin rotation/relaxation technique (μSR) at ambient- and under hydrostatic pressure. Even in presence of a CDW phase around 470 K [1], we detect a superconducting transition at 5 K. The magnetic penetration depth, obtained from transverse-field μSR could be fitted with an isotropic s-wave model, instead of the two-gap s+s wave model reported previously [2]. The observable difference between the muon spectra collected in zero field above and below Tc, suggests the presence of a spontaneous magnetic field in the superconducting state and most likely reflects time-reversal symmetry breaking below Tc. To elucidate the correlation between CDW and SC, we performed μSR experiments under hydrostatic pressure, which provide information on the nature of the superconducting-gap symmetry. Finally, by using AC-susceptibility- and μSR measurements under pressure we could reconstruct the complete pressure-temperature phase diagram of SrPt2As2.
| Position | Postdoc |
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