INFLUENCE OF MAGNETIC VACANCIES ON SPIN EXCITATIONS IN THE RARE-EARTHORTHOFERRITES RFE1-XALXO3 (R=GD, HO)

Citation
Aa. Mukhin et al., INFLUENCE OF MAGNETIC VACANCIES ON SPIN EXCITATIONS IN THE RARE-EARTHORTHOFERRITES RFE1-XALXO3 (R=GD, HO), Physics letters. A, 198(2), 1995, pp. 158-162
Citations number
11
Categorie Soggetti
Physics
Journal title
ISSN journal
03759601
Volume
198
Issue
2
Year of publication
1995
Pages
158 - 162
Database
ISI
SICI code
0375-9601(1995)198:2<158:IOMVOS>2.0.ZU;2-X
Abstract
We have observed a strong influence of non-magnetic impurity Al3+ ions (magnetic vacancies) on spin excitations in GdFe0.9Al0.1O3 and HoFe0. 925Al0.075O3 at frequency nu = 2-33 cm-1. A significant growth of the frequencies of both AFMR modes nu1 and nu2 at low temperatures was fou nd in GdFe0.9Al0.1O3 compared to pure GdFeO3. The anomalies observed i n the behaviour of the AFMR modes for HoFe0.925Al0.075O3 at T(M) = 60 K give evidence of a new first-order spin reorientational phase transi tion from the GAMMA4(GxFz) phase to the antiferromagnetic phase GAMMA1 (G(y)) induced by the magnetic vacancies.