Article Dans Une Revue Physical Review B: Condensed Matter (1978-1997) Année : 1990

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

Résumé

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.

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hal-04944345 , version 1 (05-03-2025)

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W. Kang, S. Tomić, J.R. Cooper, D. Jérome. Phase transition and non-Ohmic electrical transport in the spin-density-wave state of the organic conductor tetramethyltetraselenafulvalinium hexafluorophosphate [(TMTSF)2PF6]. Physical Review B: Condensed Matter (1978-1997), 1990, 41 (7), pp.4862-4865. ⟨10.1103/PhysRevB.41.4862⟩. ⟨hal-04944345⟩
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