Abstract
The orthorhombic rare-earth manganite compounds RMnO3 show a global magnetic order for , and several representatives are multiferroic with a cycloidal spin ground state order for . We deduce from the temperature dependence of spin–phonon coupling in Raman spectroscopy for a series of RMnO3 compounds that their spin order locally persists up to about twice TN. Along the same line, our observation of the persistence of the electromagnon in GdMnO3 up to is attributed to a local cycloidal spin order for , in contrast to the hitherto assumed incommensurate sinusoidal phase in the intermediate temperature range. The development of the magnetization pattern can be described in terms of an order–disorder transition at Tcycl within a pseudospin model of localized spin cycloids with opposite chirality.
Highlights
January 2017Abstract attribution to the author(s) and the title of the work, journal citation
Since the discovery of the giant magnetoelectric effect [1,2,3,4], the study of multiferroics, where an electric field E can affect the magnetic properties and vice versa, has gained strong interest [5,6,7,8,9,10,11,12,13]
We have investigated the temperature-dependent behavior of phonons and electromagnons on multiferroic
Summary
Abstract attribution to the author(s) and the title of the work, journal citation. The orthorhombic rare-earth manganite compounds RMnO3 show a global magnetic order for T < TN , and several representatives are multiferroic with a cycloidal spin ground state order for and DOI. Raman spectroscopy for a series of RMnO3 compounds that their spin order locally persists up to about twice TN. Our observation of the persistence of the electromagnon in GdMnO3 up to T » 100 K is attributed to a local cycloidal spin order for T > Tcycl, in contrast to the hitherto assumed incommensurate sinusoidal phase in the intermediate temperature range. Tcycl within a pseudospin model of localized spin cycloids with opposite chirality
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