On the absence of bipolarons in manganese perovskites

The paramagnetic phase of La 0.65Ca 0.35MnO 3 and La 0.65Pb 0.35MnO 3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons...

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Bibliographic Details
Published inMaterials letters Vol. 59; no. 2; pp. 297 - 301
Main Authors Chipara, M., Skomski, R., Liou, S.-H., Dowben, P.A., Adenwalla, S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2005
Subjects
Electron spin resonance
Electronic materials
Manganese perovskites
Polaron/bipolaron
Electronic materials
76.50+g
Polaron/bipolaron
Electron spin resonance
Manganese perovskites
75.30.Gw
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Summary:The paramagnetic phase of La 0.65Ca 0.35MnO 3 and La 0.65Pb 0.35MnO 3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons ( g≈2), but the characteristic high-spin bipolaron lines ( g≈4) are absent. The results are inconsistent with the presence of high-spin bipolarons. The evidence with respect to low-spin bipolarons is less conclusive, although the temperature dependence of the resonance line parameters speaks against the presence of low-spin bipolarons.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2004.10.007