Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-10-24
Phys. Rev. B 78, 144427 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 2 eps figures, accepted by Physical Review B
Scientific paper
10.1103/PhysRevB.78.144427
Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr$_{2}$O$_{4}$, we discuss its low-energy fluctuation spectrum. We identify the Goldstone modes of the conical cycloidal order, and deduce their dispersion relations whose signature anisotropy in momentum space reflects the symmetries broken by the ordered state. We discuss the soft polarization fluctuations, the `electromagnons', associated with these magnetic modes and make several experimental predictions which can be tested in neutron scattering and optical experiments.
Sarma Sankar Das
Tewari Sumanta
Toner John
Zhang Chuanwei
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