Electron localization in mixed-valence manganites
Citation:J M D Coey, M Viret, L Ranno, K Ounadjela. 'Electron localization in mixed-valence manganites' in Physical Review Letters, 75, (21), 1995, pp 3910 - 3913
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Mixed-valence manganites (A3+0.7B2+0.3)MnO3 exhibit a resistivity peak with giant negative magnetoresistance below the Curie point. Residual resistivity ranges from 5?10-8 to 8?103 m, but the electronic heat capacity when A=Y or La is that of a normal d-band metal; 6 mJ mole-1K-2. Spatial fluctuations in the Coulomb and spin-dependent potentials localize the eg(*) electrons in wave packets that are large on the scale of the Mn-Mn separation. Transport in the magnetically localized state involves zero-point-energy assisted hopping or tunneling of electrons from one weakly localized wave packet to another.
Author: COEY, JOHN MICHAEL DAVID
Publisher:American Physical Society
Series/Report no:Physical Review Letters
Availability:Full text available