Physics – Condensed Matter – Superconductivity
Scientific paper
2008-11-20
Phys. Rev. Lett. 102, 147004 (2009)
Physics
Condensed Matter
Superconductivity
Physical Review Letters, to be published
Scientific paper
We have performed low-temperature specific heat and thermal conductivity measurements of the Ni-based superconductor BaNi$_2$As$_2$ ($T_\mathrm{c}$ = 0.7 K) in magnetic field. In zero field, thermal conductivity shows $T$-linear behavior in the normal state and exhibits a BCS-like exponential decrease below $T_\mathrm{c}$. The field dependence of the residual thermal conductivity extrapolated to zero temperature is indicative of a fully gapped superconductor. This conclusion is supported by the analysis of the specific heat data, which are well fit by the BCS temperature dependence from $T_\mathrm{c}$ down to the lowest temperature of 0.1 K.
Bauer Eric D.
Kurita Nobuyuki
Movshovich Roman
Ronning Filip
Singh David J.
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