Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 469, Issue 7-8, Pages 268-272Publisher
ELSEVIER
DOI: 10.1016/j.physc.2009.02.006
Keywords
Nano-granular; Superconducting Nb thin films; Disordered system
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Funding
- DST of the Govt. of India
- CSIR
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We report on low temperature transport measurements on nano-granular Nb thin films deposited on Si (100) substrates using DC magnetron sputtering. The superconducting transition temperature (T-c) is found to decrease monotonically with the increase of the lattice parameter (a) irrespective of its thickness and grain size. The superconducting transition temperature is found to depend only on the lattice parameter whereas the normal state resistivity depends both on lattice parameter and the details of the sample morphology. We have modeled this T, variation with lattice expansion in terms of Debye temperature reduction using Morse potential as the interatomic potential in Nb. (C) 2009 Elsevier B.V. All rights reserved.
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