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 ‘forbidden frequencies’ in the de Haas–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 Haas–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 ‘forbidden frequency’ $\beta-\alpha$ 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 Lifshitz–Kosevich formula.



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