Differences in the Resistive and Thermodynamic Properties of the Single Crystalline Chiral Superconductor Candidate SrPtAs

2022/10/21 by A. Weiland, Weiland, A., F. B. Santos +9
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Rare-earth and actinide compounds #Physics of Superconductivity and Magnetism

paper · pdf · doi:10.48550/arxiv.2210.12189

Abstract

\requiremediawiki-texvcThe locally non-centrosymmetric superconductor SrPtAs is proposed to host a topological chiral d-wave state, but experimental reports have been limited to polycrystalline samples. Here we report the synthesis of single crystalline SrPtAs grown from Pb flux. SrPtAs crystallizes in the hexagonal space group P6₃/mmc with lattice parameters a = 4.2445(4) Å and c = 8.9513(18) Å. Magnetic susceptibility and electrical resistivity measurements reveal a superconducting transition at T_c ∼2.2 K, in agreement with previous reports on polycrystalline samples. Surprisingly, heat capacity data show only a small bulk transition at 0.7 K. We discuss the possible origins of the discrepancy between the various measurements.

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