Critical imperfect nesting in (TMTSF)2PF6

G. M. Danner, P. M. Chaikin, S. T. Hannahs

    Research output: Contribution to journalArticle

    Abstract

    We have investigated the temperature, pressure, and field dependence of the spin density wave (SDW) transition in the organic superconductor (TMTSF) 2PF6 and derived parameters for this transition. The SDW can be characterized by the degree to which the two Fermi surfaces couple or "nest" as measured by the imperfect nesting bandwidth t′b. Perfect nesting (maximum TSDW) occurs for t′b = 0, and increasing pressure increases t′b and suppresses TSDW to 0 K at a critical value t′b* . The increase of TSDW with field has been shown to be orbitally driven, and the field dependence is nearly quadratic for fields in the c direction. We have made quantitative observations of the field dependence of TSDW at ambient pressure to 29 T and under hydrostatic pressure to 8 T. From our measurements at ambient pressure we are able to extract t′b and t′b* using mean field theory and observe TSDW= 12.1 ± 0.1 K, t′b=4.5±0.3 K, and t′b*=11.3±0.2 K. Under a hydrostatic pressure of 5.2±0.2 kbar, t′b increases to 11.0±0.3 K with TSDW decreasing to 3.3±0.1 K. The high pressure results are consistent with the value of t′b* from, the ambient pressure measurements. We also observe no dependence of TSDW with field in the a or b directions, in contrast to previous results.

    Original languageEnglish (US)
    Pages (from-to)2727-2731
    Number of pages5
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume53
    Issue number5
    StatePublished - 1996

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    Spin density waves
    hydrostatic pressure
    Hydrostatic pressure
    organic superconductors
    pressure measurement
    Mean field theory
    pressure distribution
    Fermi surface
    pressure dependence
    Fermi surfaces
    Pressure measurement
    Superconducting materials
    bandwidth
    temperature dependence
    Bandwidth
    Temperature
    Direction compound

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Danner, G. M., Chaikin, P. M., & Hannahs, S. T. (1996). Critical imperfect nesting in (TMTSF)2PF6 . Physical Review B - Condensed Matter and Materials Physics, 53(5), 2727-2731.

    Critical imperfect nesting in (TMTSF)2PF6 . / Danner, G. M.; Chaikin, P. M.; Hannahs, S. T.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 5, 1996, p. 2727-2731.

    Research output: Contribution to journalArticle

    Danner, GM, Chaikin, PM & Hannahs, ST 1996, 'Critical imperfect nesting in (TMTSF)2PF6 ', Physical Review B - Condensed Matter and Materials Physics, vol. 53, no. 5, pp. 2727-2731.
    Danner, G. M. ; Chaikin, P. M. ; Hannahs, S. T. / Critical imperfect nesting in (TMTSF)2PF6 . In: Physical Review B - Condensed Matter and Materials Physics. 1996 ; Vol. 53, No. 5. pp. 2727-2731.
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