Open AccessELECTRONIC SPIN RESONANCE STUDY OF PEROVSKITE-TYPE MANGANITES
Author(s) -
Jiang Yong,
Guang Li,
Xin Zeng,
Yingping Yang,
Yuan Song-Liu,
Jin Si-Zhao
Publication year - 2000
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.49.1846
Subject(s) - laser linewidth , condensed matter physics , electron paramagnetic resonance , atmospheric temperature range , materials science , ferromagnetic resonance , paramagnetism , resonance (particle physics) , nuclear magnetic resonance , spin (aerodynamics) , physics , magnetic field , magnetization , atomic physics , laser , optics , thermodynamics , quantum mechanics , meteorology
The electron spin resonance behavior of two typical systems with Mn3+ /Mn4+=2∶1 and 1∶1 within the temperature range T>TC is s tudied experimentally. The results show that there exists a temperature Tmi n(>TC)dividing the magnetic behavior above TC into t wo distinguishable regime. While T>Tmin, The ESR spectrum consists of one symmetrical resonance line. The Lande factor is independent of temperature and close to the value of free electron (20023) and the linewidth increase s linearly with increasing temperature. Some distortions are observed when the t emperature is lower than Tmin. The line shape becomes unsymmetrical. The g factor become dependent on the temperature and the linewidth increases ano malously with decreasing temperature. These results point out that the complete paramagnetism exits only in the temperature range T>Tmin. When T Cmin,the anomalous paramagnetic behavior may be caused by t he magnetic inhomogeneity. The mechanism of resonance linewidth broadening is di scussed based on an analysis of the linewidth above Tmin, suggesting that the exchange narrowing spin-spin interaction and the spin-lattice interacti on are two possible reasons of linewidth changes in the high temperature regime.