© 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.
- de Haas-van Alphen oscillations
- high magnetic fields
- organic metals
Audouard, A., Fortin, J. Y., Vignolles, D., Lyubovskii, R. B., Drigo, L., Shilov, G. V., Duc, F., Zhilyaeva, E. I., Lyubovskaya, R. N., & Canadell, E. (2015). Non-Lifshitz-Kosevich field- and temperature-dependent amplitude of quantum oscillations in the quasi-two dimensional metal θ-(ET)<inf>4</inf>ZnBr<inf>4</inf>(C<inf>6</inf>H<inf>4</inf>Cl<inf>2</inf>). Journal of Physics Condensed Matter, 27(31), . https://doi.org/10.1088/0953-8984/27/31/315601