Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2

Details Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2 Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2

2011-02-04

arxiv.org/abs/1102.0834v1

J. Phys.: Conf. Ser. 273, 012097 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, to be published in J. Phys.: Conf. Ser

Scientific paper

We have performed low-temperature specific heat $C$ and thermal conductivity $\kappa$ measurements on the Ni-pnictide superconductors BaNi$_2$As$_2$ ($T_\mathrm{c}$=0.7 K and SrNi$_2$P$_2$ ($T_\mathrm{c}$=1.4 K). The temperature dependences $C(T)$ and $\kappa(T)$ of the two compounds are similar to the results of a number of s-wave superconductors. Furthermore, the concave field responses of the residual $\kappa$ for BaNi$_2$As$_2$ rules out the presence of nodes on the Fermi surfaces. We postulate that fully gapped superconductivity could be universal for Ni-pnictide superconductors. Specific heat data on Ba$_{0.6}$La$_{0.4}$Ni$_2$As$_2$ shows a mild suppression of $T_\mathrm{c}$ and $H_\mathrm{c2}$ relative to BaNi$_2$As$_2$.

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