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>)

Alain Audouard, Jean Yves Fortin, David Vignolles, Rustem B. Lyubovskii, Loïc Drigo, Gena V. Shilov, Fabienne Duc, Elena I. Zhilyaeva, Rimma N. Lyubovskaya, Enric Canadell

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    © 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.
    Original languageEnglish
    Article number315601
    JournalJournal of Physics Condensed Matter
    Volume27
    Issue number31
    DOIs
    Publication statusPublished - 12 Aug 2015

    Keywords

    • de Haas-van Alphen oscillations
    • high magnetic fields
    • organic metals

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