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Anisotropy and field-dependence of the spin-density-wave dynamics in the quasi one-dimensional conductor (TMTSF) 2 PF 6

Author

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  • P. Zornoza
  • K. Petukhov
  • M. Dressel
  • N. Biskup
  • T. Vuletić
  • S. Tomić

Abstract

The anisotropic and non-linear transport properties of the quasi one-dimensional organic conductor (TMTSF) 2 PF 6 have been studied by dc, radiofrequency, and microwave methods. Microwave experiments along all three axes reveal that collective transport, which is considered to be the fingerprint of the spin-density-wave condensate, also occurs in the perpendicular b ′ direction. The pinned mode resonance is present in the a and b ′ -axes response, but not along the least conducting c * direction. The ac-field threshold, above which the spin-density-wave response is non-linear, strongly decreases as the temperature drops below 4 K. With increasing strength of the microwave electric field and of the radiofrequency signal, the pinned mode and the screened phason loss-peak shift to lower frequencies. In the non-linear regime, in addition to the phason relaxation mode with Arrhenius-like resistive decay, an additional mode with very long and temperature-independent relaxation time appears below 4 K. We attribute the new process to short-wavelength excitations associated with discommensurations of the spin density wave close to commensurability. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • P. Zornoza & K. Petukhov & M. Dressel & N. Biskup & T. Vuletić & S. Tomić, 2005. "Anisotropy and field-dependence of the spin-density-wave dynamics in the quasi one-dimensional conductor (TMTSF) 2 PF 6," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 46(2), pages 223-230, July.
    • Handle: RePEc:spr:eurphb:v:46:y:2005:i:2:p:223-230
    DOI: 10.1140/epjb/e2005-00223-3
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