Critical fields and magnetoresistance in the molecular superconductors (TMTSF)2X

M. J. Naughton, I. J. Lee, P. M. Chaikin, G. M. Danner

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The resistive transition to the superconducting state in the quasi-one dimensional molecular organic metal (TMTSF)2PF6 has been measured under 6 kbar pressure for magnetic fields applied along the intrachain (a), interchain (b′) and interplane (c*) directions. Pronounced positive curvature in Hc2(T) is observed, with no sign of saturation, in the basal plane directions a and b′, in contrast to previous publications on this material, but similar to recent results by Lee, et al. on a related compound, (TMTSF)2ClO4. A new crossover or reversal of anisotropy occurs near Tc/2, below which the critical field along b′ exceeds that along a. Moreover, Hc2 in these directions exceeds the Chandrasekhar-Clogston limit, reaching as much as 3 times HCC. The normal state magnetoresistance displays peculiar behavior in both materials at low temperature, with a local maximum in the vicinity of the superconducting transition. In addition, we report on a new series of angular magnetoresistance oscillations observed in both the ClO4 and PF6 salts.

    Original languageEnglish (US)
    Pages (from-to)1481-1485
    Number of pages5
    JournalSynthetic Metals
    Volume85
    Issue number1-3
    DOIs
    StatePublished - Mar 15 1997

    Keywords

    • Magnetotransport
    • Molecular superconductors
    • Superconducting phase transitions

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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