Onset of superconductivity in 2D granular films composed of Bi clusters

Details Onset of superconductivity in 2D granular films composed of Bi clusters Onset of superconductivity in 2D granular films composed of Bi clusters

1999-09-26

arxiv.org/abs/cond-mat/9909370v1

Physics

Condensed Matter

Superconductivity

2 LaTex pages; 1 eps figure; phbauth.cls and elsart.cls needed (both attached). Presented in LT22, Helsinki, Finland. To appea

Scientific paper

10.1016/S0921-4526(99)02295-4

Two dimensional films comprising of Bi clusters ranging in size from 25 to 100 $\mathrm{\AA}$ show an influence of the underlying matrix on normal state resistivity and the superconducting transition temperature $T_\mathrm{c}$. This is in contrast to crystalline Bi. Quantum size effects are observed by changing the deposition temperature, which determines cluster size. These observations can be attributed to superconductivity at the surface. Implications for the requirement of a critical number of superconducting clusters before the establishment of global phase coherence are briefly discussed.

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