TY - JOUR

T1 - Non-Lifshitz-Kosevich field- and temperature-dependent amplitude of quantum oscillations in the quasi-two dimensional metal θ-(ET)4ZnBr4(C6H4Cl2)

AU - Audouard, Alain

AU - Fortin, Jean Yves

AU - Vignolles, David

AU - Lyubovskii, Rustem B.

AU - Drigo, Loïc

AU - Shilov, Gena V.

AU - Duc, Fabienne

AU - Zhilyaeva, Elena I.

AU - Lyubovskaya, Rimma N.

AU - Canadell, Enric

PY - 2015/8/12

Y1 - 2015/8/12

N2 - © 2015 IOP Publishing Ltd. According to band structure calculations, the Fermi surface of the quasi-two dimensional metal θ-(ET)4ZnBr4(C6H4Cl2) illustrates the linear chain of coupled orbits model. Accordingly, de Haas-van Alphen oscillations spectra recorded in pulsed magnetic field of up to 55 T evidence many Fourier components, the frequency of which are linear combinations of the frequencies relevant to the closed α and the magnetic breakdown β orbits. The field and temperature dependence of their amplitude are quantitatively accounted for by analytic calculations including, beyond the Lifshitz-Kosevich formula, second-order terms in damping factors due to the oscillation of the chemical potential as the magnetic field varies. Whereas these second-order terms are negligible for the orbits α, β and 2β - α, they are solely responsible for the 'forbidden orbit' β - α and its harmonic and have a significant influence on Fourier components such as 2α and β + α, yielding strongly non-Lifshitz-Kosevich behaviour in the latter case.

AB - © 2015 IOP Publishing Ltd. According to band structure calculations, the Fermi surface of the quasi-two dimensional metal θ-(ET)4ZnBr4(C6H4Cl2) illustrates the linear chain of coupled orbits model. Accordingly, de Haas-van Alphen oscillations spectra recorded in pulsed magnetic field of up to 55 T evidence many Fourier components, the frequency of which are linear combinations of the frequencies relevant to the closed α and the magnetic breakdown β orbits. The field and temperature dependence of their amplitude are quantitatively accounted for by analytic calculations including, beyond the Lifshitz-Kosevich formula, second-order terms in damping factors due to the oscillation of the chemical potential as the magnetic field varies. Whereas these second-order terms are negligible for the orbits α, β and 2β - α, they are solely responsible for the 'forbidden orbit' β - α and its harmonic and have a significant influence on Fourier components such as 2α and β + α, yielding strongly non-Lifshitz-Kosevich behaviour in the latter case.

KW - de Haas-van Alphen oscillations

KW - high magnetic fields

KW - organic metals

U2 - 10.1088/0953-8984/27/31/315601

DO - 10.1088/0953-8984/27/31/315601

M3 - Article

VL - 27

IS - 31

M1 - 315601

ER -