Magnetic ordering and charge dynamics in Kappa -(BEDT-TTF) sub(2)Cu[N(CN) sub(2)]Cl

The Mott insulator Kappa -(BEDT-TTF) sub(2)Cu[N(CN) sub(2)]Cl consists of molecular dimers arranged on an anisotropic triangular lattice. At low temperatures a pronounced dielectric anomaly is observed, and eventually a canted antiferromagnetic ground state forms. Optical spectroscopy clearly rules...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2013-10, Vol.25 (43), p.1-7
Main Authors: Tomic, S, Pinteric, M, Ivek, T, Sedlmeier, K, Beyer, R, Wu, D, Schlueter, J A, Schweitzer, D, Dressel, M
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Charge
Condensed matter
Ferromagnetism
Filing
Ground state
Order disorder
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Summary:The Mott insulator Kappa -(BEDT-TTF) sub(2)Cu[N(CN) sub(2)]Cl consists of molecular dimers arranged on an anisotropic triangular lattice. At low temperatures a pronounced dielectric anomaly is observed, and eventually a canted antiferromagnetic ground state forms. Optical spectroscopy clearly rules out charge imbalance and the existence of quantum electric dipoles with a dipolar-spin coupling. Here we suggest a novel form of spin-charge coupling where the prominent in-plane dielectric response in Kappa -(BEDT-TTF) sub(2)Cu[N(CN) sub(2)]Cl is explained by short-range discommensurations of the antiferromagnetic phase in the temperature range 30 K < T < 50 K, and by relaxation of charged domain walls in the ferromagnetic structure at lower temperatures.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/25/43/436004