Vortex pinning in layered organic superconductors: {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br
- Department of Physics, University of Miami, Coral Gables, Florida 33124 (United States)
- Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Magnetization studies on organic single-crystal superconductors of {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br with the field {ital H} parallel to the {ital b} axis (perpendicular to the conducting plane) show anomalous field and temperature dependence of vortex pinning in the mixed state. At high temperatures, the magnetization {ital M} decays with increasing field with a power-law dependence. The normalized relaxation rate {ital S}={ital d}(ln{ital M})/{ital d}(ln{ital t}) decreases monotonically with {ital H}. At low temperatures ({ital T}{lt}7 K), a change of sign in the curvature of {ital M}({ital H}) is observed, accompanied by a corresponding change in {ital S} as a function of {ital H}. Measurement of the irreversibility field {ital H}{sub rev} shows a universal power-law dependence of {ital H}{sub rev} on (1{minus}{ital T}/{ital T}{sub {ital c}}) in the temperature range investigated. We suggest that the magnetic anomaly observed is due to a dimensional crossover in the nature of vortex pinning. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 280107
- Report Number(s):
- CONF-951101-; ISSN 0021-8979; TRN: 96:018989
- Journal Information:
- Journal of Applied Physics, Vol. 79, Issue 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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