Vortex pinning in layered organic superconductors: κ-(BEDT-TTF)2Cu[N(CN)2]Br

S. Khizroev, F. Zuo, G. C. Alexandrakis, J. A. Schlueter, U. Geiser, J. M. Williams

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4 Scopus citations


Magnetization studies on organic single-crystal superconductors of κ-(BEDT-TTF)2Cu[N(CN)2]Br with the field H parallel to the 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 M decays with increasing field with a power-law dependence. The normalized relaxation rate S = d(In M)/d(In t) decreases monotonically with H. At low temperatures (T<7 K), a change of sign in the curvature of M(H) is observed, accompanied by a corresponding change in S as a function of H. Measurement of the irreversibility field Hrev shows a universal power-law dependence of Hrev on (1-T/Tc) in the temperature range investigated. We suggest that the magnetic anomaly observed is due to a dimensional crossover in the nature of vortex pinning.

Original languageEnglish (US)
Pages (from-to)6586-6588
Number of pages3
JournalJournal of Applied Physics
Issue number8 PART 2B
StatePublished - Apr 15 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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