Low-field and anomalous high-field Hall effect in (TMTSF)2ClO 4

M. Ribault , D. Jérome , J. Tuchendler , C. Weyl , K. Bechgaard

We report the study of the Hall effect, at low temperature, in (TMTSF) 2ClO4 (slow-cooled state), up to 80 kOe, with the field perpendicular to the (a-b) plane. We show that the linear field dependence of the weak Hall resistance, up to 40 kOe, supports the interpretation of the conducting phase in terms of a quasi planar Fermi surface with a density of carriers corresponding to the stoechiometry of the salt. At higher field, a strong and sharp increase of the Hall constant, is the signature of a phase transition to a semi-metallic state. The transition magnetic field is very temperature dependent. Below 0.7 K, in the semi-metallic state, remarkable steps and plateaux, of the Hall resistance are observed, suggesting either the quantization of the Hall constant of carriers in weakly coupled (a-b) planes or the existence of a sequence of electron-hole instabilities (excitonic phases).

Mots clés: carrier density; excitons; Fermi surface; Hall effect; one dimensional conductivity; organic compounds; low field Hall effect; excitonic phases; anomalous high field Hall effect; TMTSF sub 2 ClO sub 4; linear field dependence; conducting phase; quasi planar Fermi surface; phase transition; semi metallic state; transition magnetic field; electron hole instabilities

Domaines: Articles anciens

M. Ribault, D. Jérome, J. Tuchendler, C. Weyl, K. Bechgaard. Low-field and anomalous high-field Hall effect in (TMTSF)2ClO 4. Journal de Physique Lettres, 1983, 44 (23), pp.953-961. ⟨10.1051/jphyslet:019830044023095300⟩. ⟨jpa-00232287⟩