Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillations spectrum of the organic metal $θ$-(BETS)$_4$HgBr$_4$(C$_6$H$_5$Cl) at low temperature

David Vignolles; Alain Audouard; Rustem B. Lyubovskii; Sergei I. Pesotskii; Jérome Béard; Enric Canadell; Gena V. Shilov; Olga A. Bogdanova; Elena I. Zhilayeva; Rimma N. Lyubovskaya

doi:10.1016/j.solidstatesciences.2007.07.025

paper

Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillations spectrum of the organic metal $θ$ -(BETS) $_{4}$ HgBr $_{4}$ (C $_{6}$ H $_{5}$ Cl) at low temperature

arXiv:0707.2331 · doi:10.1016/j.solidstatesciences.2007.07.025

Abstract

The organic metal θ $- (B E T S)$ _4 $H g B r$ _4 $(C$ _6 $H$ _5$Cl) is known to undergo a phase transition as the temperature is lowered down to about 240 K. X-ray data obtained at 200 K indicate a corresponding modification of the crystal structure, the symmetry of which is lowered from quadratic to monoclinic. In addition, two different types of cation layers are observed in the unit cell. The Fermi surface (FS), which can be regarded as a network of compensated electron and hole orbits according to band structure calculations at room temperature, turns to a set of two alternating linear chains of orbits at low temperature. The field and temperature dependence of the Shubnikov-de Haas oscillations spectrum have been studied up to 54 T. Eight frequencies are observed which, in any case, points to a FS much more complex than predicted by band structure calculations at room temperature, even though some of the observed Fourier components might be ascribed to magnetic breakdown or frequency mixing. The obtained spectrum could result from either an interaction between the FS's linked to each of the two cation layers or to an eventual additional phase transition in the temperature range below 200 K.

accepted for publication in Solid State Sciences

Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillations spectrum of the organic metal $θ$ -(BETS) $_{4}$ HgBr $_{4}$ (C $_{6}$ H $_{5}$ Cl) at low temperature

Abstract

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Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillations spectrum of the organic metal θ-(BETS)4​HgBr4​(C6​H5​Cl) at low temperature

Abstract

References in corpus (9)

Cited by in corpus (2)

Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillations spectrum of the organic metal $θ$ -(BETS) $_{4}$ HgBr $_{4}$ (C $_{6}$ H $_{5}$ Cl) at low temperature