Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-04-26
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 2 figures, minor typos corrected
Scientific paper
10.1103/PhysRevB.65.035418
The semiclassical Lifshitz-Kosevich-type description is given for the angular dependence of quantum oscillations with combination frequencies in a multiband quasi-two-dimensional Fermi liquid with a constant number of electrons. The analytical expressions are found for the Dingle, thermal, spin, and amplitude (Yamaji) reduction factors of the novel combination harmonics, where the latter two strongly oscillate with the direction of the field. At the "magic" angles those factors reduce to the purely two-dimensional expressions given earlier. The combination harmonics are suppressed in the presence of the non-quantized ("background") states, and they decay exponentially faster with temperature and/or disorder compared to the standard harmonics, providing an additional tool for electronic structure determination. The theory is applied to Sr$_2$RuO$_4$.
Alexandrov Alexandre S.
Bratkovsky Alexander M.
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