Volume 59, Number 3, August 2002
|Page(s)||451 - 457|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Direct evidence for double-exchange coupling in - substituted x ,
Materials Chemistry Lab, Department of Chemistry
Indian Institute of Technology - Kanpur 208 016 India
2 Institute for Solid State Research - 20 Helmholtz Straße D-01069, Dresden, Germany
Corresponding author: email@example.com
Accepted: 8 May 2002
The x system shows an innate relationship between and ions by a unique double-exchange–mediated transport behavior. This is exonerated by the coexistence of and (range 330–245 for . For %, the hole carrier mass influences the transport property. X-ray absorption spectra suggest that the - match is due to the transport mediated by the redox pair and also due to the broad low-spin :4d conduction band. For x>0.2, obeys a modified variable-range hopping model, where , suggesting a random magnetic potential which localizes the charge carriers.
PACS: 75.50.Pp – Magnetic semiconductors / 75.30.Vn – Colossal magnetoresistance / 75.30.Et – Exchange and superexchange interactions
© EDP Sciences, 2002
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