Influence of cluster size on the normal- and superconducting-state properties of granular Bi films
C. Vossloh, M. Holdenried, H. Micklitz
DOI 10.1103/PhysRevB.58.12422 · Physical Review B
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Abstract
The Hall coefficient RH and the magnetic-field dependence of the superconducting transition temperature Tc of granular films built from well defined Bi clusters has been measured as a function of Bi cluster size L (3.5<~L<~10nm) in magnetic fields up to 8 T and at temperatures T>1.8K. From these experimental results we can conclude that with decreasing L the original rhombohedral bulk structure of the Bi clusters becomes more and more distorted (increasing number of defects), until at L=L*≈4.0nm the structure changes into the “amorphous” Bi structure. For L=L* the Bi conduction electrons become almost localized and (dBc2/dT)Tc has an unusually large value of -16.7 T/K. The good agreement between the L dependencies of normal and superconducting properties indicates that the electronic structure of the Bi clusters changes with L, but is rather homogeneous for a given L.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | midpoint |
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