Superconductivity in SrNi2As2 Single Crystals
E.D. Bauer, F. Ronning, B.L. Scott, J.D. Thompson (LANL)
TL;DR
This study reports the discovery of bulk superconductivity in SrNi2As2 single crystals at 0.62 K, with detailed measurements of resistivity and heat capacity, and also investigates magnetic ordering in EuNi2As2.
Contribution
It provides the first evidence of superconductivity in SrNi2As2 and characterizes its properties, while also exploring magnetic order in EuNi2As2.
Findings
SrNi2As2 is a bulk superconductor at T_c=0.62 K.
EuNi2As2 shows magnetic order at T_m=14 K.
No superconductivity observed in EuNi2As2 above 0.4 K.
Abstract
The electrical resistivity \rho(T) and heat capacity C(T) on single crystals of SrNi2As2 and EuNi2As2 are reported. While there is no evidence for a structural transition in either compound, SrNi2As2 is found to be a bulk superconductor at T_c=0.62 K with a Sommerfeld coefficient of \gamma= 8.7 mJ/mol K^2 and a small upper critical field H_{c2} \sim 200 Oe. No superconductivity was found in EuNi2As2 above 0.4 K, but anomalies in \rho and C reveal that magnetic order associated with the Eu^{2+} magnetic moments occurs at T_m = 14 K.
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