Article ID Journal Published Year Pages File Type
1819227 Physica C: Superconductivity and its Applications 2009 5 Pages PDF
Abstract

We report on low temperature transport measurements on nano-granular Nb thin films deposited on Si (1 0 0) substrates using DC magnetron sputtering. The superconducting transition temperature (Tc) 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 Tc variation with lattice expansion in terms of Debye temperature reduction using Morse potential as the interatomic potential in Nb.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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