Fully gapped superconductivity in SrNi$_2$P$_2$

Details Fully gapped superconductivity in SrNi$_2$P$_2$ Fully gapped superconductivity in SrNi$_2$P$_2$

2010-12-08

arxiv.org/abs/1012.1766v2

Phys. Rev. B 83, 094527 (2011)

Physics

Condensed Matter

Superconductivity

7 figures, 5 figures, accepted for publication in Physical Review B

Scientific paper

We investigated the superconducting gap structure of SrNi$_2$P$_{2}$ ($T_c$=1.4 K) via low-temperature magneto-thermal conductivity $\kappa(T,H)$ measurements. Zero field thermal conductivity $\kappa$ decreases exponentially $\kappa \propto$ exp($-aT_c/T$) with $a$=1.5, in accord with the BCS theory, and rolls over to a phonon-like $\kappa\propto T^3$ behavior at low temperature, similar to a number of conventional s-wave superconductors. In addition, we observed a "concave" field dependence of the residual linear term $\kappa_0(H)/T$. These facts strongly rule out the presence of nodes in the superconducting energy gap of SrNi$_2$P$_{2}$. Together with a fully gapped Fermi surface in the superconducting state of BaNi$_2$As$_{2}$ ($T_c$=0.6-0.7 K), demonstrated in our recent work, these results lead us to postulate that fully gapped superconductivity is a universal feature of Ni-based pnictide superconductors.

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