Differences in the resistive and thermodynamic properties of the single crystalline chiral superconductor candidate SrPtAs
Ashley Weiland, Frederico B. Santos, Joe D. Thompson, Eric D. Bauer, Sean M. Thomas, Priscila F. S. Rosa
DOI 10.1103/PhysRevMaterials.7.054802 · Physical Review Materials
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Abstract
The locally noncentrosymmetric 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 Tc∼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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrPtAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | midpoint |
| SrPtAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | midpoint |
| SrPtAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.7 | Pressure not reported | unknown |
| SrPt0.97As1.03 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | midpoint |
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