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Study of crystal-field excitations and Raman active phonons in o-DyMnO.sub.3./sub..
- 1.0371415 - FZÚ 2012 RIV NL eng J - Journal Article
Jandl, S. - Mansouri, S. - Mukhin, A.A. - Ivanov, V.Yu. - Balbashov, A. - Gospodino, M.M. - Nekvasil, Vladimír - Orlita, Milan
Study of crystal-field excitations and Raman active phonons in o-DyMnO3.
Journal of Magnetism and Magnetic Materials. Roč. 323, č. 8 (2011), s. 1104-1108. ISSN 0304-8853. E-ISSN 1873-4766
R&D Projects: GA AV ČR IAA100100803
Institutional research plan: CEZ:AV0Z10100521
Keywords : manganite * multiferroic * Raman active phonons * crystal fields
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.780, year: 2011
In DyMnO3 orthorhombic single crystals,the weak Raman active phonon softening below T=100 K is correlated with the study of infrared active Dy3+ CF excitations as a function of temperature and under applied magnetic field.We detect five H13/2 CF transitions that we predict with appropriate CF Hamiltonian and we confirm that the magnetic easy axis lies in the ab plane.While the CF energy level shifts below T=100 K reflect different displacements of the oxygen ions that contribute to the phonon softening,lifting of the ground state Kramers doublet degeneracy(~30 cm-1) is observed below TN=39 K due to the anisotropic Mn3+-Dy3+ interaction, which could be responsible for the stability of the bc-cycloid ferroelectric phase.
Permanent Link: http://hdl.handle.net/11104/0204935
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