Publication details

Direct observation of double exchange in ferromagnetic La0.7Sr0.3CoO3 by broadband ellipsometry

Authors

FRIŠ Pavel MUNZAR Dominik CAHA Ondřej DUBROKA Adam

Year of publication 2018
Type Article in Periodical
Magazine / Source Physical Review B
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1103/PhysRevB.97.045137
Keywords double exchange; ellipsometry; ferromagnetic cobaltites; La0.7Sr0.3CoO3;
Description We present results of our broadband ellipsometry measurements of the optical response of ferromagnetic La0.7Sr0.3CoO3. Our data show that the ferromagnetic transition is accompanied by a transfer of optical spectral weight from an absorption band centered at 1.5 eV to a narrow component of the Drude-like peak. The associated reduction of the intraband kinetic energy is significantly larger than k(B)T(c), confirming that the double exchange plays a major role in the ferromagnetism of doped cobaltites. In conjunction with results of recent theoretical studies, the temperature dependence of the Drude-like peak suggests that the double exchange is mediated by t(2g) orbitals.
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