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Charge and vortex Kosterlitz–Thouless transitions in Bi-superconducting mixed crystal thin films

Physica C: Superconductivity, ISSN: 0921-4534, Vol: 317, Page: 661-665
1999
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Temperature ( T ) dependence of the sheet resistance ( R □ ) has been investigated on the c -axis oriented thin films of the (Bi2212/Bi2201) mixed crystal with different molar fractions. The R □ – T superconducting characteristic deteriorated with reduction of the Bi2212 fraction, and almost disappears at 48 mol% where a superconductor-to-insulator transition took place, with the resistance in the normal state, R N, reaching 4.1 kΩ at 80 K. This R N value is close to the universal quantum number, h /(2 e ) 2 ≅6.5 kΩ predicted by the Kosterlitz–Thouless (KT) transition theory. The R □ – T characteristics of the 48 mol% thin film can be elucidated as a competitive process of KT transition brought about by charge or vortex in the two-dimensional layer structure.

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