Quantum oscillations of a linear chain of coupled orbits with small effective masses: The organic metal θ-(BETS)4coBr4(C6H4Cl2)

被引：1
|
作者：
Audouard, Alain [1 ]
Fortin, Jean-Yves [2 ]
Vignolles, David [3 ]
Lyubovskii, Rustem B. [4 ]
Drigo, Loic [3 ]
Zhilyaeva, Elena I. [4 ]
Lyubovskaya, Rimma N. [4 ]
机构：
[1] UPR 3228 CNRS INSA UGA UPS, Lab Natl Champs Magnet Intenses, 143 Ave Rangueil, F-31400 Toulouse, France
[2] CNRS UMR 7198, Dept Phys Mat & Mat, Inst Lamour, F-54506 Vandoeuvre Les Nancy, France
[3] UPR 3228 CNRS INSA UGA UPS, Lab Natl Champs Magnet Intenses, 143 Ave Rangueil, F-31400 Toulouse, France
[4] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, MD, Russia
来源：
SYNTHETIC METALS | 2017年 / 226卷
关键词：
de Haas-van Alphen oscillations; Shubnikov-de Haas oscillations; Magnetic breakdown; Organic metals; AMPLITUDE;
D O I：
10.1016/j.synthmet.2017.02.009
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
De Haas van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations of the organic metal theta(BETS)(4)CoBr4(C6H4Cl2) are studied in magnetic fields of up to 55T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits alpha and beta, which have small effective masses compared to other organic metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. in addition, strongly non-Lifshitz-Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov-de Haas oscillations are not accounted for by this model. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：171 / 176
页数：6
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