Phase transition and non-Ohmic electrical transport in the spin-density-wave state of the organic conductor tetramethyltetraselenafulvalinium hexafluorophosphate [(TMTSF)2PF6]

W. Kang, S. Tomić, J. R. Cooper, D. Jérome

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Abstract

We report the electric field dependent conductivity in the spin-density-wave (SDW) state of the organic conductor (TMTSF)2PF6 using two different methods for making contacts. A new clamped-contact method reveals that the onset of the SDW transition of (TMTSF)2PF6 may be first order when the sample is strain free. A non-Ohmic behavior of the conductivity is observed above a threshold field in the range of 15 mV/cm. The temperature dependence of the threshold field agrees with a pinning mechanism due to commensurability between the SDW and the underlying lattice. The use of classical painted contacts leads to a smearing of the originally sharp transition and modifies the temperature dependence of the threshold field.

Original languageEnglish
Pages (from-to)4862-4865
Number of pages4
JournalPhysical Review B
Volume41
Issue number7
DOIs
StatePublished - 1990

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