Quantum oscillations in the linear chain of coupled orbits: The organic metal with two cation layers θ-(ET) <inf>4</inf>CoBr <inf>4</inf>(C <inf>6</inf>H <inf>4</inf>Cl <inf>2</inf>)

A. Audouard, J. Y. Fortin, D. Vignolles, R. B. Lyubovskii, L. Drigo, F. Duc, G. V. Shilov, G. Ballon, E. I. Zhilyaeva, R. N. Lyubovskaya, E. Canadell

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    Abstract

    Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (α) and magnetic-breakdown-induced (β and 2β-α) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the "forbidden orbit"β-α amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2α and the magnetic breakdown orbit β+α, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal θ-(ET) 4CoBr 4(C 6H 4Cl 2). © Europhysics Letters Association, 2012.
    Original languageEnglish
    Article number57003
    JournalEPL
    Volume97
    Issue number5
    DOIs
    Publication statusPublished - 1 Mar 2012

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