Low Temperature Physics: 40, 344 (2014); https://doi.org/10.1063/1.4869589
Физика Низких Температур: Том 40, Выпуск 4 (Апрель 2014), c. 444-453    ( к оглавлению , назад )

Recent developments in the determination of the amplitude and phase of quantum oscillations for the linear chain of coupled orbits

Alain Audouard

Laboratoire National des Champs Magnétiques Intenses (UPR 3228 CNRS, INSA, UJF, UPS) 143 Ave. de Rangueil Toulouse, F-31400, France
E-mail: alain.audouard@lncmi.cnrs.fr

Jean-Yves Fortin

Institut Jean Lamour, Dйpartement de Physique de la Matiиre et des Matйriaux, CNRS-UMR 7198, Vandoeuvre-les-Nancy F-54506, France
E-mail: fortin@ijl.nancy-universite.fr

Received August 30, 2013

Аннотация

De Haas-van Alphen oscillations are studied for Fermi surfaces (FS) illustrating the model proposed by Pippard in the early sixties, namely the linear chain of orbits coupled by magnetic breakdown. This FS topology is relevant to many multiband quasi-two-dimensional (q-2D) organic metals such as -(BEDT–TTF)2Cu(NCS)2 and -(BEDT–TTF)4CoBr4 (C6H4Cl2) which are considered in detail. Whereas the Lifshits–Kosevich model only involves a first order development of field- and temperature-dependent damping factors, second order terms may have significant contribution to the Fourier components amplitude for such q-2D systems at high magnetic field and low temperature. The strength of these second order terms depends on the relative value of the involved damping factors, which are in turns strongly dependent on parameters such as the magnetic breakdown field, effective masses and, most of all, effective Landé factors. In addition, the influence of field-dependent Onsager phase factors on the oscillation spectra is considered.

PACS: 71.20.Rv Polymers and organic compounds;
PACS: 71.18.+y Fermi surface: calculations and measurements; effective mass, g-factor;
PACS: 71.30.+h Metal-insulator transitions and other electronic transitions.

Ключевые слова: Fermi surface, organic metals, quantum oscillations.