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Optical properties and electronic structure of multiferroic hexagonal orthoferrites RFeO3 (R = Ho, Er, Lu)
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Image of FIG. 1.
FIG. 1.

(Color online) (a) Experimental optical density spectra of hexagonal RFeO3 (R = Ho, Er, Lu) films at T = 293 K (solid lines) and T = 20 K (dashed lines). No corrections for reflection losses were taken. Inset shows 2θ/ω scans. (b) Optical spectrum of the mean value of the absorption indexes of HoFeO3 and ErFeO3 at T = 293 K (symbols) and its fit using Eq.(1) (line). Color-shaded areas show single Lorentz oscillators as obtained from the fit.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Schematic presentation of the complex in a perovskite orthoferrite and the complex in a hexagonal orthoferrite. The bond lengths are given in Å (Refs. 7 and 20). (b) Splitting and occupation of the Fe3+ ion ground state in the spherically symmetric, octahedral (Oh ), distorted octahedral (D 4 h ), and trigonal-bipyramidal (D 3 h ) complexes. Numbers show the energies of the orbitals (in eV) with respect to the ground state in the spherical coordination. (c) Ground and the four lowest excited states of Fe3+ in distorted octahedron and trigonal bipyramid. Arrows with numbers show the CF transitions and their energies (in eV). Also shown (in the middle) is the lowest CT transition from the valence to the conduction band.

Image of FIG. 3.
FIG. 3.

(Color online) Temperature dependence of optical density D in HoFeO3 at the photon energy E = 4.9 eV. Symbols show experimental values and lines are exponential fit with different parameters above and below T = 124 K.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical properties and electronic structure of multiferroic hexagonal orthoferrites RFeO3 (R = Ho, Er, Lu)