Structure and superconductivity of vapor quenched Mo and Nb films

1 January 1976

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 31 (1) , 353-358
https://doi.org/10.1063/1.30779

Abstract

Amorphous phases of Mo and Nb which are stable at room temperature have been obtained by e‐beam vapor deposition of the metals in a partial N 2 atmosphere on substrates kept below 100K. The structure of these films can be described in terms of the DRPHS model. The amorphous Mo‐films show a large increase in the superconducting transition temperature (compared to bulk Mo) while T of amorphous Nb films decreases. For the most homogeneous Mo 1−x N x films the T c obtained is near 8.5K and the transition width is ≲0.1K. In the absence of a nitrogen atmosphere pure Mo‐films, vapor quenched onto sputter cleaned substrates at 4.2°K are found to be crystalline bcc. Contamination appears to stabilize amorphous or other nonequilibrium crystalline phases (fcc, hcp).

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