Low-temperature magnetothermal transport investigation of a Ni-based superconductor BaNi2As2: evidence for fully gapped superconductivity.
We have performed low-temperature specific heat and thermal conductivity measurements of the Ni-based superconductor BaNi2As2 (T{c}=0.7 K) in a magnetic field. In a zero field, thermal conductivity shows T-linear behavior in the normal state and exhibits a BCS-like exponential decrease below T{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{c} down to the lowest temperature of 0.1 K.
Kurita
N
N
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Ronning
F
F
Tokiwa
Y
Y
Bauer
E D
ED
Subedi
A
A
Singh
D J
DJ
Thompson
J D
JD
Movshovich
R
R