Superconductivity in a PbFCl-type pnictide: NbSiAs
1 Materials and Structures Laboratory, Tokyo Institute of Technology - 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
2 Frontier Research Center, Tokyo Institute of Technology - 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
Received: 4 April 2012
Accepted: 20 June 2012
We report a new superconductor, NbSiAs, with a PbFCl-type structure, which exhibits bulk superconductivity with a superconducting transition temperature (Tc) of 8.2 K and a shielding volume fraction of 40 vol%. Isothermal magnetization and heat capacity measurements indicate NbSiAs is a BCS-like type II superconductor with a normalized specific heat jump value (Cel/γTc) of ∼1.95. Strongly hybridized bonds between Nb 4d and Si 3p orbitals enhance the Debye temperature, which is favorable for the emergence of superconductivity.
PACS: 74.10.+v – Occurrence, potential candidates / 74.25.-q – Properties of superconductors / 74.25.Kc – Phonons
© EPLA, 2012