Hc2 enhancement and giant Nernst effect in (TMTSF)2(PF)6

I. J. Lee, W. Wu, M. J. Naughton, P. M. Chaikin

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We discuss two recent discoveries in the title compound: 1) A strong enhancement in the critical field as the critical pressure for the SDW-superconductor phase boundary is approached and 2) the existence of giant resonances in the thermoelectric voltage as an applied magnetic field is rotated through the "Lebed Magic Angles". 1) Hc2 is highly anisotropic in this salt, but the enhancement is present for all field orientations. We suggest a model in which the near degeneracy of the superconducting and SDW states leads to a coexistence. The critical field is enhanced by the formation of thin slabs of superconductor (less than the penetration depth) parallel to the applied field and sandwiched by insulating SDW layers. As the temperature is lowered the slabs become thinner allowing a higher Hc2. 2) The thermoelectric voltage resonance indicates that the currents generated are "locked-in" to the interchain direction ("magic angle") nearest parallel with the applied field. With the field to one side of the magic angle there is a Lorentz force up, on the other side of the magic angle the Lorentz force is down. The size of the thermoelectric voltage is 104 larger than might be expected from conventional transport theory.

    Original languageEnglish (US)
    Title of host publicationJournal De Physique. IV : JP
    EditorsS. Brazovskii, N. Kirova, P. Monceau
    Volume12
    Edition9
    StatePublished - Nov 2002
    EventInternational Workshop on Electronic Crystals - ECRYS 2002 - Saint Flour, France
    Duration: Sep 2 2002Sep 7 2002

    Other

    OtherInternational Workshop on Electronic Crystals - ECRYS 2002
    CountryFrance
    CitySaint Flour
    Period9/2/029/7/02

    Fingerprint

    augmentation
    Lorentz force
    slabs
    electric potential
    critical pressure
    transport theory
    penetration
    salts
    magnetic fields
    temperature

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Lee, I. J., Wu, W., Naughton, M. J., & Chaikin, P. M. (2002). Hc2 enhancement and giant Nernst effect in (TMTSF)2(PF)6 . In S. Brazovskii, N. Kirova, & P. Monceau (Eds.), Journal De Physique. IV : JP (9 ed., Vol. 12)

    Hc2 enhancement and giant Nernst effect in (TMTSF)2(PF)6 . / Lee, I. J.; Wu, W.; Naughton, M. J.; Chaikin, P. M.

    Journal De Physique. IV : JP. ed. / S. Brazovskii; N. Kirova; P. Monceau. Vol. 12 9. ed. 2002.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Lee, IJ, Wu, W, Naughton, MJ & Chaikin, PM 2002, Hc2 enhancement and giant Nernst effect in (TMTSF)2(PF)6 . in S Brazovskii, N Kirova & P Monceau (eds), Journal De Physique. IV : JP. 9 edn, vol. 12, International Workshop on Electronic Crystals - ECRYS 2002, Saint Flour, France, 9/2/02.
    Lee IJ, Wu W, Naughton MJ, Chaikin PM. Hc2 enhancement and giant Nernst effect in (TMTSF)2(PF)6 . In Brazovskii S, Kirova N, Monceau P, editors, Journal De Physique. IV : JP. 9 ed. Vol. 12. 2002
    Lee, I. J. ; Wu, W. ; Naughton, M. J. ; Chaikin, P. M. / Hc2 enhancement and giant Nernst effect in (TMTSF)2(PF)6 . Journal De Physique. IV : JP. editor / S. Brazovskii ; N. Kirova ; P. Monceau. Vol. 12 9. ed. 2002.
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    abstract = "We discuss two recent discoveries in the title compound: 1) A strong enhancement in the critical field as the critical pressure for the SDW-superconductor phase boundary is approached and 2) the existence of giant resonances in the thermoelectric voltage as an applied magnetic field is rotated through the {"}Lebed Magic Angles{"}. 1) Hc2 is highly anisotropic in this salt, but the enhancement is present for all field orientations. We suggest a model in which the near degeneracy of the superconducting and SDW states leads to a coexistence. The critical field is enhanced by the formation of thin slabs of superconductor (less than the penetration depth) parallel to the applied field and sandwiched by insulating SDW layers. As the temperature is lowered the slabs become thinner allowing a higher Hc2. 2) The thermoelectric voltage resonance indicates that the currents generated are {"}locked-in{"} to the interchain direction ({"}magic angle{"}) nearest parallel with the applied field. With the field to one side of the magic angle there is a Lorentz force up, on the other side of the magic angle the Lorentz force is down. The size of the thermoelectric voltage is 104 larger than might be expected from conventional transport theory.",
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