SPECIAL ISSUE: Lattice and magnetic effects in doped manganites
Abstract
The 'double exchange' mechanism and Jahn—Teller instabilities are shown to account for the low-temperature properties of slightly doped LaMnO3 in the framework of the band insulator model. Analysis of the doping of La1-xAxMnO3 with divalent A atoms suggests that Coulomb forces cause holes to be localized near dopants, which makes the formation of conducting clusters along these charged centers a major factor in the physics of such compounds. A percolation theory analysis of experimental data is given. The two-phase coexistence regime and the large-volume Fermi surface at high concentrations are discussed. The relevance of some of the results to doping physics in cuprates is suggested.
- Publication:
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Physics Uspekhi
- Pub Date:
- June 1998
- DOI:
- 10.1070/PU1998v041n06ABEH000409
- Bibcode:
- 1998PhyU...41..589G