TY - JOUR
T1 - Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates
AU - Popova, M. N.
AU - Boldyrev, K. N.
AU - Klimin, S. A.
AU - Stanislavchuk, T. N.
AU - Sirenko, A. A.
AU - Bezmaternykh, L. N.
N1 - Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm-1 for the electron-phonon coupling constant in PrFe3(BO3)4.
AB - High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm-1 for the electron-phonon coupling constant in PrFe3(BO3)4.
KW - Electron-phonon coupling
KW - Optical spectroscopy
KW - Rare-earth iron borates
KW - Spin-phonon interactions
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U2 - 10.1016/j.jmmm.2014.10.095
DO - 10.1016/j.jmmm.2014.10.095
M3 - Article
AN - SCOPUS:84939948137
SN - 0304-8853
VL - 383
SP - 250
EP - 254
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
ER -