Localization and pair breaking parameter in superconducting molybdenum nitride thin films.

Author(s) Tsuneoka, T.; Makise, K.; Maeda, S.; Shinozaki, B.; Ichikawa, F.
Journal J Phys Condens Matter
Date Published 2017 Jan 11

We have investigated the superconductor-insulator transition in molybdenum nitride films prepared by deposition onto MgO substrates. It is indicated that the T c depression from for thick films with increase of the normal state sheet resistance was well explained by the Finkel'stein formula from the localization theory. Present analysis suggests that the superconducting-insulator transition occurs at a critical sheet resistance . It is found that the above shows different characteristics of and in the regions and , respectively, where is the classical residual resistance and A is a constant. The excess conductance due to thermal fluctuation has been analyzed by the sum of the Aslamazov-Larkin and Maki-Thompson correction terms with use of the pair breaking parameter in the latter term. The sum agrees well with the data, although the experimental results of the dependence of , that is, shows the disagreement with a linear relation derived from the localization theory.

DOI 10.1088/0953-8984/29/1/015701
ISSN 1361-648X
Citation J Phys Condens Matter. 2017;29(1):015701.

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