Magnetization and {ital H}{sub {ital c}2} of a {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br single crystal

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.2590· OSTI ID:278703

Vulcanescu, V ^[1]; Janossy, B ^[2]; Batail, P ^[3]; Fruchter, L ^[1]

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1. CNRS, Laboratoire de Physique des Solides, Universite Paris-Sud, 91405 Orsay Cedex (France)
2. High Magnetic Fields Laboratory, 166X, 38042 Grenoble Cedex 9 (France)
3. Institut des Materiaux de Nantes, 2 rue de la Houssiniere, 44072 Nantes Cedex 03 (France)

The magnetization curves of the organic superconductor {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br have been measured in fields up to 200 kOe and temperatures down to 0.4 K. Above the irreversibility field, which is found finite in the limit {ital T}{r_arrow}0, the curves can be rescaled according to the two-dimensional fluctuation theory in a high magnetic field. However, the mean field upper critical field found in this way exhibits an upturn below {ital T}{approx_equal}5 K which is not likely due to a dimensional crossover. We suggest that a diamagnetic contribution to the magnetization, in addition to the thermal fluctuations one, could be at the origin of the effect. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 278703
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CARBON NITRIDES
COPPER BROMIDES
CRITICAL FIELD
FLUCTUATIONS
MAGNETIC FIELDS
MAGNETIZATION
MONOCRYSTALS
ORGANIC SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS