Optical response of ferromagnetic YTiO3 studied by spectral ellipsometry

Kovaleva, N. N.; Boris, A. V.; Yordanov, P.; Maljuk, A.; Brücher, E.; Strempfer, J.; Konuma, M.; Zegkinoglou, I.; Bernhard, C.; Stoneham, A. M.; Keimer, B.

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Optical response of ferromagnetic YTiO₃ studied by spectral ellipsometry

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Kovaleva, N. N.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Boris, A. V.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Yordanov, P.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Maljuk, A.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Brücher, E.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Strempfer, J.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Konuma, M.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Interface Analysis (Ulrich Starke), Max Planck Institute for Solid State Research, Max Planck Society;

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Zegkinoglou, I.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Bernhard, C.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kovaleva, N. N., Boris, A. V., Yordanov, P., Maljuk, A., Brücher, E., Strempfer, J., et al. (2007). Optical response of ferromagnetic YTiO₃ studied by spectral ellipsometry. Physical Review B, 76(15): 155125.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B79B-5

Abstract

We have studied the temperature dependence of spectroscopic ellipsometry spectra of an electrically insulating, nearly stoichiometric YTiO3 single crystal with ferromagnetic Curie temperature T-C=30 K. The optical response exhibits a weak but noticeable anisotropy. Using a classical dispersion analysis, we identify three low-energy optical bands at 2.0, 2.9, and 3.7 eV. Although the optical conductivity spectra are only weakly temperature dependent below 300 K, we are able to distinguish high- and low-temperature regimes with a distinct crossover point around 100 K. The low-temperature regime in the optical response coincides with the temperature range in which significant deviations from a Curie-Weiss mean-field behavior are observed in the magnetization. Using an analysis based on a simple superexchange model, the spectral weight rearrangement can be attributed to intersite d(i)(1)d(j)(1)-> d(i)(2)d(j)(0) optical transitions. In particular, Kramers-Kronig consistent changes in optical spectra around 2.9 eV can be associated with the high-spin-state (T-3(1)) optical transition. This indicates that other mechanisms, such as weakly dipole-allowed p-d transitions and/or exciton-polaron excitations, can contribute significantly to the optical band at 2 eV. The recorded optical spectral weight gain of the 2.9 eV optical band is significantly suppressed and anisotropic, which we associate with complex spin-orbit-lattice phenomena near the ferromagnetic ordering temperature in YTiO3.