Paramagnetic limiting of the upper critical field of the layered organic superconductor

F. Zuo, J. Brooks

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

We report detailed measurements of the interlayer magnetoresistance of the layered organic superconductor (Formula presented) for temperatures down to 0.5 K and fields up to 30 T. The upper critical field is determined from the resistive transition for a wide range of temperatures and field directions. For magnetic fields parallel to the layers, the upper critical field increases approximately linearly with decreasing temperature. The upper critical field at low temperatures is compared to the Pauli paramagnetic limit, at which singlet superconductivity should be destroyed by the Zeeman splitting of the electron spins. The measured value is comparable to a value for the paramagnetic limit calculated from thermodynamic quantities but exceeds the limit calculated from BCS theory. The angular dependence of the upper critical field shows a cusplike feature for fields close to the layers, consistent with decoupled layers.

Original languageEnglish (US)
Pages (from-to)750-755
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number1
DOIs
StatePublished - 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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