Low Temperature Physics: 43, 173 (2017); https://doi.org/10.1063/1.4976631
Fizika Nizkikh Temperatur: Volume 43, Number 2 (February 2017), p. 211-226    ( to contents , go back )

Transmission and tunneling probability in two-band metals: influence of magnetic breakdown on the Onsager phase of quantum oscillations

Jean-Yves Fortin

Institut Jean Lamour, Département de Physique de la Matière et des Matériaux, Groupe de Physique Statistique, CNRS-Nancy-Université BP 70239, F-54506 Vandoeuvre les Nancy Cedex, France
E-mail: jean-yves.fortin@univ-lorraine.fr

Alain Audouard

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

Received July 19, 2016


Tunneling amplitude through magnetic breakdown (MB) gap is considered for two-bands Fermi surfaces illustrated in many organic metals. In particular, the S-matrix associated to the wave function transmission through the MB gap for the relevant class of differential equations is the main object allowing the determination of tunneling probabilities and phases. The calculated transmission coefficients include a field-dependent Onsager phase. As a result, quantum oscillations are not periodic in 1/B for finite magnetic breakdown gap. Exact and approximate methods are proposed for computing ratio amplitudes of the wave function in interacting two-band models.

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.

Key words: Fermi surface, organic metals, quantum oscillations

Published online: December 26, 2016

Download 1512559 byte View Contents