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Magneto-orbital Coupling in Quadruple Perovksites
Quadruple perovskite manganites present new paradigms in the study of spin, charge, and orbital degrees of freedom, and the fascinating properties that can emerge when these are ordered and cross-coupled. For example, using neutron and x-ray diffraction, symmetry analysis, and Landau theory, we showed that the magnetic structure in CaMn7O12 is characterized by a continuous evolution from a nonchiral, nonpolar spin density wave towards a constant-moment magneto-orbital helix (that is both chiral and polar) with a modulated spin helicity. We are now exploring how these, and similar, exotic magneto-orbital textures can be tuned by introducing additonal competing structural and magnetic instabilities. N. Perks et al., Nature Comm. 3, 1277 (2012) R. D. Johnson et al., Physical Review B 93, 180403(R) (2016) R. D. Johnson et al., Physical Review B 96, 054448 (2017)
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