Electronic aspects of the ferromagnetic transition in manganese perovskites

J. H. Park, C. T. Chen, Sang-Wook Cheong, W. Bao, G. Meigs, V. Chakarian, Y. U. Idzerda

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300 Scopus citations

Abstract

We have investigated the electronic structure associated with the ferromagnetic transition of La1 − x Cax MnO3 and La1 − x Pbx MnO3 using high resolution photoemission, Mn 2p resonant photoemission, and O 1s x-ray absorption spectroscopies. The data clearly show that the band gap collapses below the Curie temperature (TC) and the density of states at the Fermi level increases with cooling, providing a conclusive microscopic evidence for an insulator-metal transition. Our results suggest that strong small polaron effects, which contribute to a charge fluctuation energy of ∼ 1.5 eV, are responsible for the insulating behavior above TC which has been enigmatic in the double-exchange model.

Original languageEnglish (US)
Pages (from-to)4215-4218
Number of pages4
JournalPhysical review letters
Volume76
Issue number22
DOIs
StatePublished - May 27 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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