Metal-insulator transition in the dimerized organic conductor κ−(BEDT-TTF)2Hg(SCN)2Br

The organic charge-transfer salt κ−(BEDT-TTF)2Hg(SCN)2Br is a quasi-two-dimensional metal with a half-filled conduction band at ambient conditions. When cooled below T=80K, it undergoes a pronounced transition to an insulating phase where the resistivity increases many orders of magnitude. In order...

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Bibliographic Details
Published in:Physical review. B 2017-08, Vol.96 (8)
Main Authors: Ivek, Tomislav, Beyer, Rebecca, Badalov, Sabuhi, Čulo, Matija, Tomić, Silvia, Schlueter, John A, Zhilyaeva, Elena I, Lyubovskaya, Rimma N, Dressel, Martin
Format: Article
Language:English
Subjects:
Charge transfer
Conduction bands
Conduction cooling
Conductors
Insulators
Metal-insulator transition
Organic charge transfer salts
Phase transitions
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Summary:The organic charge-transfer salt κ−(BEDT-TTF)2Hg(SCN)2Br is a quasi-two-dimensional metal with a half-filled conduction band at ambient conditions. When cooled below T=80K, it undergoes a pronounced transition to an insulating phase where the resistivity increases many orders of magnitude. In order to elucidate the nature of this metal-insulator transition, we have performed comprehensive transport, dielectric and optical investigations. The findings are compared with other dimerized κ−(BEDT-TTF) salts, in particular the Cl analog, where a charge-order transition takes place at TCO=30K.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.085116