Low Temperature Physics: 37, 762 (2011); https://doi.org/10.1063/1.3670031 (9 pages)
Физика Низких Температур: Том 37, Выпуск 9-10 (Сентябрь 2011), c. 959-969    ( к оглавлению , назад )

Field-induced charge-density-wave transitions in the organic metal α-(BEDT-TTF)2KHg(SCN)4 under pressure

D. Andres, M.V. Kartsovnik, W. Biberacher, and K. Neumaier

Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany
E-mail: mark.kartsovnik@wmi.badw-muenchen.de

I. Sheikin

Laboratoire National des Champs Magnétiques Intenses, CNRS, 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France

H. Müller

European Synchrotron Radiation Facility, F-38043 Grenoble, France

N.D. Kushch

Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia

Received May 10, 2011


Successive magnetic-field-induced charge-density-wave transitions in the layered molecular conductor α-(BEDT-TTF)2KHg(SCN)4 are studied in the hydrostatic pressure regime, in which the zero field chargedensity- wave (CDW) state is completely suppressed. The orbital effect of the magnetic field is demonstrated to restore the density wave, while the orbital quantization induces transitions between different CDW states at changing the field strength. The latter appear as distinct anomalies in the magnetoresistance as a function of field. The interplay between the orbital and Pauli paramagnetic effects acting, respectively, to enhance and to suppress the CDW instability is particularly manifest in the angular dependence of the field-induced anomalies.

PACS: 71.45.Lr Charge-density-wave systems;
PACS: 71.30.+h Metal-insulator transitions and other electronic transitions;
PACS: 74.70.Kn Organic superconductors.

Key words: organic conductor, electronic phase transitions, charge-density waves, field-induced charge-density waves, high pressure, magnetoresistance.