SPIN EXCITATIONS AND NEW ORIENTATIONAL TRANSITION IN A HOLMIUM ORTHOFERRITE WITH MAGNETIC VACANCIES - HOFE1-XALXO3

Authors
MUKHIN AA FEDOROV IV EGOYAN AE LEBEDEV SP KOZLOV GV PROKHOROV AS BALBASHOV AM PARSEGOV IY
Citation
Aa. Mukhin et al., SPIN EXCITATIONS AND NEW ORIENTATIONAL TRANSITION IN A HOLMIUM ORTHOFERRITE WITH MAGNETIC VACANCIES - HOFE1-XALXO3, JETP letters, 59(1), 1994, pp. 49-54
Citations number
8
Categorie Soggetti
Physics
Journal title
JETP letters → ACNP
ISSN journal
00213640
Volume
59
Issue
1
Year of publication
1994
Pages
49 - 54
Database
ISI
SICI code
0021-3640(1994)59:1<49:SEANOT>2.0.ZU;2-5
Abstract
Dynamic properties of holmium orthoferrite are strongly influenced by low concentrations of nonmagnetic Al3+ dopant ions (magnetic vacancies ). Anomalies are observed on the temperature dependence of two antifer romagnetic-resonance modes in the submillimeter spectra of HoFe1-xAlxO 3. These anomalies (a discontinuity and slope changes in the frequenci es) point to a spin-flip transition at T = 60 K from a weakly ferromag netic Gamma(4) state to an antiferromagnetic Gamma(1) state, induced b y magnetic vacancies. A model is offered to explain the observations. The exchange field of the magnetic vacancies is determined.