Lattice and magnetic effects in doped manganites

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 La_1-xA_xMnO₃ 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.

PACS: 64.60.Ak, 71.70.Gm, 71.70.−d, 75.50.Pp (all)
DOI: 10.1070/PU1998v041n06ABEH000409
URL: https://ufn.ru/en/articles/1998/6/g/
Web of Science

000075347000007
Citation: Gor’kov L P "Lattice and magnetic effects in doped manganites" Phys. Usp. 41 589–594 (1998)

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Оригинал: Горьков Л П «Решеточные и магнитные эффекты в легированных манганитах» УФН 168 665–671 (1998); DOI: 10.3367/UFNr.0168.199806g.0665

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