Electron Paramagnetic Resonance Measurements of La2/3 (Ca,Ba)1/3MnO3

Journal of Inorganic Materials

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Electron Paramagnetic Resonance Measurements of La_2/3 (Ca,Ba)_1/3MnO₃

PENG Gang¹; YUAN Song-Liu¹; JIN Si-Zhao²

1. Institute of Material Physics and Department of Physics; Huazhong University of Science & Technology; Wuhan 430074; China; 2. Structure Analysis Cente; University of Science and Technology of China; Hefei 230026; China

Received:2001-11-21 Revised:2002-04-19 Published:2003-01-20 Online:2003-01-20

Abstract

Abstract: The electron paramagnetic resonance spectra of La_2/3Ca_1/3MnO₃ and La_2/3Ba_1/3MnO₃ were
measured at various temperatures. It is show that there exists a temperature T min by which the conventional paramagnetic region of T>T_c
is divided into two different temperature ranges, T>T_min and T_c<T<T_min. At T>T_min, the peak-to-peak linewidth
ΔH_pp as a function of temperature shows a linear decrease on cooling, while at T<T_min, ΔH_pp is anomalously
increased on further cooling. The results can be explained by the “bottleneck” spin-lattice relaxation model. The average A-site ionic size <r_A>
affects strongly the interaction of the spin-lattice and spin-spin.

Key words: EPR, linewidth, bottleneck model, CMR

CLC Number:

TM271

PENG Gang,YUAN Song-Liu,JIN Si-Zhao. Electron Paramagnetic Resonance Measurements of La_2/3 (Ca,Ba)_1/3MnO₃[J]. Journal of Inorganic Materials.

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Electron Paramagnetic Resonance Measurements of La_2/3 (Ca,Ba)_1/3MnO₃

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