Effect of structure on the properties of La-deficient La0.54Ca0.32MnO3-δ manganite

X-ray diffraction (XRD) and electron paramagnetic resonance (EPR) have been carried out in a La-deficient sample of La0.54Ca0.32MnO3. From the XRD pattern it was found that the crystal structure has been distorted by the deficiency in A (=La, Ca) position. The temperature dependence of EPR line inte...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2005-01, Vol.355 (1-4), p.377-381
Main Authors: ULYANOV, A. N, HUYNH, T. N, QUANG, P. H, SINH, N. H, YU, S. C
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron paramagnetic resonance and relaxation
Exact sciences and technology
Magnetic properties and materials
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Magnetotransport phenomena, materials for magnetotransport
Manganites
Physics
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Summary:X-ray diffraction (XRD) and electron paramagnetic resonance (EPR) have been carried out in a La-deficient sample of La0.54Ca0.32MnO3. From the XRD pattern it was found that the crystal structure has been distorted by the deficiency in A (=La, Ca) position. The temperature dependence of EPR line intensity was successfully fitted by the exponential law based on the small polaron hopping model. High values of an activation energy () derived from EPR data are believed to relate to the above distortion, but EPR line-width, DeltaHpp, and a slope, b, of the DeltaHpp temperature dependence are not.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2004.11.065