Browsing by Author "Subedi, A."

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Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2
(2011)
Kurita, N.
;
Ronning, F.
;
Miclea, C. F.
;
Tokiwa, Y.
;
Bauer, E. D.
;
Subedi, A.
;
Singh, D. J.
;
Sakai, H.
;
Thompson, J. D.
;
Movshovich, R.
;
Kurita, N; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Ronning, F; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Miclea, C F; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Tokiwa, Y; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Bauer, E D; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Subedi, A; 4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA
;
Singh, D J; 4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA
;
Sakai, H; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Thompson, J D; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
;
Movshovich, R; 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
We have performed low-temperature specific heat C and thermal conductivity κ measurements on the Ni-pnictide superconductors BaNi2As2 (Tc = 0.7K) and SrNi2P2 (Tc = 1.4K). The temperature dependences C(T) and κ(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 κ for BaNi2As2 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 Ba0.6La0.4Ni2As2 shows a mild suppression of Tc and Hc2 relative to BaNi2As2.