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A transition from large to small polarons in the La0.75Ca0.25MnO3 perovskite system

Abstract:

A quantitative determination of the statistical distribution of the Mn-O instantaneous bond lengths in the La0.75Ca0.25MnO3 system by Mn K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy shows that the giant magneto-resistance (GMR) transition occurs at a crossover from a metallic phase with large (or intermediate) polarons to an insulating phase where small polarons coexist with large (or intermediate) polarons. In the GMR region, the two Mn polaronic domains coexist and s...

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Publication status:
Published

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Authors


Lanzara, A More by this author
Brunelli, M More by this author
Bianconi, A More by this author
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Volume:
59
Issue:
10-12
Pages:
2220-2223
Publication date:
1998
DOI:
ISSN:
0022-3697
URN:
uuid:34c380b7-4689-4c50-862c-5c256cca5276
Source identifiers:
142367
Local pid:
pubs:142367

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