Open AccessThe study of Raman spectrum, distortion of lattice and spin reorientation phase transition on Pr doped DyFeO3 system
Author(s) -
Ming Liu,
Shixun Cao,
Yuan Shu-Juan,
Baojuan Kang,
Bo Lü,
Jincang Zhang
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.147601
Subject(s) - raman spectroscopy , condensed matter physics , materials science , doping , lattice (music) , diffraction , phase transition , ferromagnetism , ion , lattice constant , nuclear magnetic resonance , physics , optics , acoustics , quantum mechanics
Pr doped rare-earth orthoferrites DyFeO3 is synthesized by solid state reaction. X-ray diffraction shows that the lattice parameters of Dy1-xPrxFeO3increase and distortion of lattice decreases with Pr content x increasing. Raman spectroscopy reveals that the change of effective mass (meff) [meff=xmPr+(1-x)mDy] together with lattice structure change results in the shift of vibration modes. With the increase of Pr content, Raman modes of wave number less than 200 cm-1 remain constant, but the modes of wave number greater than 200 cm-1 decrease with Pr content increasing (except the mode B3u near 420 cm-1). The weak ferromagnetic ordering, created by Dzyaloshinsky-Moriya interaction, is reduced with doping level increasing. The interaction of rare earth ions with Fe3+ ion, together with the change of lattice distortion, results in the increasing of spin reorientation phase transition temperature when xx increasing to over 0.3.