Mixed-state magnetoresistance in organic superconductors {kappa}{endash}(BEDT-TTF){sub 2}Cu(NCS){sub 2}
- 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)
We report transport measurements with field and current parallel to the {ital a} axis (perpendicular to the conducting plane) in the organic superconductor {kappa}{endash}(BEDT-TTF){sub 2}Cu(NCS){sub 2}. The magnetoresistance displays a peak effect as a function of field and temperature with the peak fields increasing linearly with decreasing temperatures. The peak resistance is found to be greater than the normal-state value extrapolated from both high- and low-field measurements. The results are in sharp contrast to the conventional dissipation mechanisms in the mixed state for anisotropic superconductors, as in the case of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}. We propose a phenomenological model that the peak in the magnetoresistance is caused by a scattering mechanism due to a strong coupling to the underlying crystal lattice of fluctuating vortices (vortex polarons). The model can semiquantitatively fit the data. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 392017
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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