Study of crystal-field excitations and Raman active phonons in o-DyMnO.sub.3./sub..

0371415 - FZÚ 2012 RIV NL eng J - Článek v odborném periodiku
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
Grant CEP: GA AV ČR IAA100100803
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: manganite * multiferroic * Raman active phonons * crystal fields
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.780, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0204935