Twin-boundary effect on the Hall conductivity in high-T{sub c} superconducting thin films
- Departamento de Quimica, ITN, P-2686 Sacavem (Portugal)
- Fachbereich Physik, Bergische Universitaet, Wuppertal, D-42097 (Germany)
The pinning influence on the Hall conductivity in the mixed state of high-temperature superconductors is still experimentally and theoretically controversial. In this work, the effect of twin-boundary pinning on the Hall conductivity is studied, with particular emphasis on the high-field results. The longitudinal and Hall resistivities were measured in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and YbBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films, up to 18 T: a signature due to the pinning of the vortices in the twin boundaries is clearly visible in the longitudinal resistivity {rho}{sub xx} and in the Hall resistivity {rho}{sub xy}, but disappears when the Hall conductivity {sigma}{sub xy}{congruent}{rho}{sub xy}/{rho}{sub xx}{sup 2} is computed. However, at lower temperatures, a minimum of d{sigma}{sub xy}/dT is proved to be a weak signature of the twin-boundary pinning. These results are confirmed by similar measurements done on one sample rotated 16{degree} away from the magnetic field direction. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 538592
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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