Vibrating reed study of the flux line dynamics of κ-(ET)2Cu[N(CN)2]Br

Ulrike G. Lehmann, Lance E. De Long, Hau H. Wang, K. Douglas Carlson, Jack M. Williams

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1 Scopus citations


Vibrating reed measurements were performed on single-crystal samples of κ-(ET)2- Cu[N(CN)2]Br in an applied magnetic field H oriented either parallel ("longitudinal") or perpendicular ("transverse") to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation and H<0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperature TQ below the superconducting transition temperature Tc(≈11.6 for H=0). The shoulder disappeared near H≈0.7 T, accompanied by an abrupt change in the slope of TQ(H), corresponding to a similar change in the slope of the upper critical magnetic field Hc2 measured by Kwok et al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties of κ-(ET)2Cu[N(CN)2]Br. TQ data taken for the transverse orientation fell far below estimates of Hc2., indicating the existence of a substantial region of flux line (FL) mobility below Hc2(T). The location of a peak in NMR relaxation observed by De Soto et al. lies close to TQ for the transverse orientation.

Original languageEnglish
Pages (from-to)793-797
Number of pages5
JournalJournal of Superconductivity
Issue number5
StatePublished - Oct 1994


  • Vibrating reed
  • flux pinning
  • organic superconductors
  • type-II superconductors
  • vortex lattice melting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)


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