title: Low-temperature magnetothermal transport investigation of a Ni-based superconductor BaNi2As2: evidence for fully gapped superconductivity.
abstract: 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.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: N
authors.initials: N
authors.lastname: Kurita
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: Y
authors.initials: Y
authors.lastname: Tokiwa
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.forename: A
authors.initials: A
authors.lastname: Subedi
authors.forename: D J
authors.initials: DJ
authors.lastname: Singh
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson
authors.forename: R
authors.initials: R
authors.lastname: Movshovich