Hall coefficients in the superconductor-insulator transition of Bi2+xSr2−xCuOy: Measurement of Hall-bar shaped single crystals fabricated by excimer-laser cutting
- 11 November 1996
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 69 (20) , 3075-3077
- https://doi.org/10.1063/1.116844
Abstract
Hall coefficients and resistivities of a series of Bi2+xSr2−xCuOy single crystals were measured to investigate the relation between the carrier concentration and the disorder of the system in the superconductor‐insulator transition. Excimer‐laser cutting technique was applied to fabricate the Hall‐bar shaped samples in order to determine precisely the transport properties of the single crystals. The Hall coefficients were found to be independent of the temperature, which suggests Coulomb interaction was negligible in the localized regime of Bi2+xSr2−xCuOy. We found the Ioffe–Legel condition kFl∼1 laid around n0∼8×1020 cm−3 in this system, and the carriers in the localized regime were essentially ‘‘metallic.’’Keywords
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