Magnetothemopower study of quasi two-dimensional organic conductor $α$-(BEDT-TTF)$_2$KHg(SCN)$_4$

E. S. Choi; J. S. Brooks; J. S. Qualls

doi:10.1103/PhysRevB.65.205119

paper

Magnetothemopower study of quasi two-dimensional organic conductor $α$ -(BEDT-TTF) $_{2}$ KHg(SCN) $_{4}$

arXiv:cond-mat/0104447 · doi:10.1103/PhysRevB.65.205119

Abstract

We have used a low-frequency magneto-thermopower (MTEP) method to probe the high magnetic field ground state behavior of $α$ -(BEDT-TTF) $_{2}$ KHg(SCN) $_{4}$ along all three principal crystallographic axes at low temperatures. The thermopower tensor coefficients ( $S_{xx}, S_{y x}$ and $S_{z z}$ ) have been measured to 30 T, beyond the anomalous low temperature, field-induced transition at 22.5 T. We find a significant anisotropy in the MTEP signal, and also observe large quantum oscillations associated with the de Haas - van Alphen effect. The anisotropy indicates that the ground state properties are clearly driven by mechanisms that occur along specific directions for the in-plane electronic structure. Both transverse and longitudinal magnetothermopower show asymptotic behavior in field, which can be explained in terms of magnetic breakdown of compensated closed orbits.

9 pages, 10 figures

Magnetothemopower study of quasi two-dimensional organic conductor α-(BEDT-TTF)2​KHg(SCN)4​

Abstract

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Magnetothemopower study of quasi two-dimensional organic conductor $α$ -(BEDT-TTF) $_{2}$ KHg(SCN) $_{4}$