Abstract
Pulsed laser deposition under nitrogen radical irradiation was applied to the synthesis of ReN x crystalline phases, and the effect of the varying nitrogen stoichiometry on the crystal structure and superconductivity was investigated. X-ray diffraction revealed that, at low nitrogen content ( x ∼0.06, deposition temperature T d = 873 K), ReN x maintained the hexagonal structure of the Re metal (having a hexagonal close-packing (hcp) structure), where the nitride ions occupy interstitial sites among Re atoms. It was found that the crystal structure is cubic when x = 0.17 ( T d = 603 K) and 0.22 ( T d = room temperature). X-ray photoelectron spectroscopy detected N 1s 1/2 signals close to those for Si 3N 4 and BN, indicating the strong covalent character of Re–N bonds. First principle band calculations indicated that the density of states at Fermi energy of ReN consists of mainly Re 5d bands. The superconducting transition temperature T c increased steeply from 1.6 K (Re metal) to 4.8 K (ReN 0.22).
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