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Abstract: We have uncovered a giant gyrotropic magneto-optical response for doped ferromagnetic manganite La2/3Ca1/3MnO3 around the near room-temperature paramagnetic-to-ferromagnetic transition. At odds with current wisdom, where this response is usually assumed to be fundamentally fixed by the electronic band structure, we point to the presence of small polarons as the driving force for this unexpected phenomenon. We explain the observed properties by the intricate interplay of mobility, Jahn-Teller effect, and spin-orbit coupling of small polarons. As magnetic polarons are ubiquitously inherent to many strongly correlated systems, our results provide an original, general pathway towards the generation of magnetic-responsive gigantic gyrotropic responses that may open novel avenues for magnetoelectric coupling beyond the conventional modulation of magnetization. © 2016 American Physical Society.
Fuente: PRL 117, 026401 (2016)
Publisher: American Physical Society
Publication date: 01/07/2016
No. of pages: 5
Publication type: Article
DOI: 10.1103/PhysRevLett.117.026401
ISSN: 0031-9007,1079-7114
Spanish project: MAT2014-56063-C2-1-R ; FIS2012-37549-C05-04 ; IS2015-64886-C5-2-P ; MAT2012-37776
Publication Url: https://doi.org/10.1103/PhysRevLett.117.026401
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CASALS, BLAI
CICHELERO, RAFAEL
PABLO GARCIA FERNANDEZ
FRANCISCO JAVIER JUNQUERA QUINTANA
PESQUERA, DAVID
CAMPOY-QUILES, MARIANO
INFANTE, INGRID C.
SANCHEZ, FLORENCIO
FONTCUBERTA, JOSEP
HERRANZ, GERVASI
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