Anomalous magnetization in single-crystal {kappa}-[bis(ethylenedithiotetrathiafulvalene)]{sub 2}Cu[N(CN){sub 2}]Br superconductors
- 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 detailed magnetization studies on single-crystal superconductors of {kappa}-[bis(ethylenedithiotetra- thiafulvalene)]{sub 2}Cu[N(CN){sub 2}]Br with the field {ital H} parallel to the {ital b} axis (perpendicular to the conducting plane). At high temperatures, the magnetization, {ital M}, displays a power-law dependence on {ital H} with {ital M}{proportional_to}{ital H}{sup {ital n}} and {ital n}={minus}2/3. The critical current extrapolated from the width of the hysteresis loop depends on {ital H} exponentially. At low temperatures ({ital T}{lt}7 K), an anomalous field dependence with a change of sign in the curvature of {ital M}({ital H}) is observed. The anomalous field dependence is qualitatively similar to the fishtail magnetization reported for the oxide superconductors. Possible mechanisms giving rise to this effect are discussed.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 122326
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 18; Other Information: PBD: 1 Nov 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Anomalous magnetic properties in the single-crystal {kappa}-(BEDT-TTF){sub 2}Cu(NCS){sub 2} superconductor
Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(N(CN) sub 2 )Br (where BEDT-TTF represents bis(ethylenedithio) tetrathiofulvalene)