# Groupe de Physique Statistique

## Equipe 106, Institut Jean Lamour

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### Articles dans des revues à comité de lecture

 New insights on frequency combinations and â€˜forbidden frequenciesâ€™ in the de Haasâ€“van Alphen spectrum of $kappa$-(ET)$_2$Cu(SCN)$_2$ Audouard A., Fortin J.-Y., Vignolles D., Laukhin V.N., Kushch N.D., Yagubskii E.B. J. Phys.: Condens. Matter 28 (2016) 275702 DOI : 10.1088/0953-8984/28/27/275702 Abstract de Haasâ€“van Alphen oscillations of the organic metal $\kappa$-(ET)$_2$Cu(SCN)$_2$ have been measured up to 55 T at liquid helium temperatures. The Fermi surface of this charge transfer salt is a textbook example of a linear chain of orbits coupled by magnetic breakdown. Accordingly, the oscillation spectrum is composed of linear combinations of the frequencies linked to the $\alpha$ and magnetic breakdown-induced $\beta$ orbits. The field and temperature dependence of all the observed Fourier components, in particular the â€˜forbidden frequencyâ€™ $\beta-\alpha$ which cannot correspond to a classical orbit, are quantitatively accounted for by analytical calculations based on a second order development of the free energy, i.e. beyond the first order Lifshitzâ€“Kosevich formula.