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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2007, Volume 86, Issue 11, Pages 822–827
(Mi jetpl1345)
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This article is cited in 21 scientific papers (total in 21 papers)
CONDENSED MATTER
Optical study of the electronic structure and magnetic ordering in a weak ferromagnet FeBO$_3$
P. A. Markovina, A. M. Kalashnikovaab, R. V. Pisareva, Th. Rasingb a Ioffe Physico-Technical Institute, Russian Academy of Sciences
b IMM, Radboud University Nijmegen, 6525ED Nijmegen, The Netherlands
Abstract:
Spectral dependences of the relative permittivity ɛ = ɛ1 − iɛ2 of a uniaxial weak ferromagnet FeBO3 are measured for two principal polarizations in the energy range 0.6–5.6 eV. The positions have been determined for the charge-transfer transitions that make the main contribution to absorption above the bandgap and determine the refractive-index dispersion below the bandgap. The isotropic magnetic contribution to the refractive index has been detected by studying the temperature dependence of the refractive index in the range 100–700 K; its value (≈2 × 10−2) is found to be record high for magnetic dielectrics. The energy shift of the effective oscillator, which characterizes the shift of the positions of the charge-transfer transitions due to magnetic ordering, is determined from these data within the framework of a single-oscillator model. The value of the exchange striction in FeBO3 is determined from optical measurements.
Received: 15.10.2007
Citation:
P. A. Markovin, A. M. Kalashnikova, R. V. Pisarev, Th. Rasing, “Optical study of the electronic structure and magnetic ordering in a weak ferromagnet FeBO$_3$”, Pis'ma v Zh. Èksper. Teoret. Fiz., 86:11 (2007), 822–827; JETP Letters, 86:11 (2007), 712–717
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