Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-04
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$_2$.
Bauer Eric D.
Kurita Nobuyuki
Miclea Corneliu F.
Movshovich Roman
Ronning Filip
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