Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy₃Fe₅O₁₂ garnet
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Kang, T. D.
Department of Physics, New Jersey Institute of Technology, Newark, USA
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Standard, E. C.
Department of Physics, New Jersey Institute of Technology, Newark, USA
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Rogers, P. D.
Department of Physics, New Jersey Institute of Technology, Newark, USA
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Ahn, K. H.
Department of Physics, New Jersey Institute of Technology, Newark, USA
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Sirenko, Andrei A.
Department of Physics, New Jersey Institute of Technology, Newark, USA
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Dubroka, Adam
Department of Physics, University of Fribourg, Switzerland
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Bernhard, Christian
Department of Physics, University of Fribourg, Switzerland
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Park, S.
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey USA - Department of Physics, Chung-Ang University, Seoul, Korea
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Choi, Y. J.
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey USA - Department of Physics and IPAP, Yonsei University, Seoul, Korea
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Cheong, S.-W.
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey USA
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Published in:
- Physical Review B - Condensed Matter and Materials Physics. - 2012, vol. 86, no. 14, p. 144112
English
Far-infrared spectra of ferrimagnetic Dy₃Fe₅O₁₂ single crystals have been studied in the spectral range between 12 and 700 cm⁻¹ and in a wide temperature range between 5 K and 300 K using transmission spectroscopy and rotating analyzer ellipsometry. In the temperature range below TC = 16 K for the magnetic ordering of Dy³⁺ spins, a number of ligand field and Kaplan-Kittel (KK) exchange resonance modes have been found. Temperature dependencies of their frequencies allowed us to estimate the ratio between the Fe-Dy and Dy-Dy exchange constants. We found that variation of the oscillator strength of the KK modes correlates with the magnetic-field-induced changes of magnetic permeability. The low-temperature peak in the static value of the dielectric function at TC = 16 K may be related to the observed temperature-induced variation of the oscillator strength of the optical phonons.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/302704
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