Charge localization in disordered colossal-magnetoresistance manganites

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.4541· OSTI ID:538540

Li, Q ^[1]; Zang, J; Bishop, A R ^[2]; Soukoulis, C M ^[1]

---

1. Ames Laboratory--U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
2. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, MS B262, Los Alamos, New Mexico 87545 (United States)

The metallic or insulating nature of the paramagnetic phase of the colossal-magnetoresistance manganites is investigated via a double-exchange Hamiltonian with diagonal disorder. The mobility edge trajectory is determined with the transfer-matrix method. Density-of-states calculations indicate that random hopping alone is not sufficient to induce Anderson localization at the Fermi level with 20{endash}30{percent} doping. We argue that the metal-insulator transition is likely due to the formation of localized polarons from nonuniform extended states as the effective bandwidth is reduced by random hoppings and electron-electron interactions. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Ames National Laboratory
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 538540
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 8 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
DOPED MATERIALS
ELECTRIC CHARGES
ELECTRIC CONDUCTIVITY
ELECTRON-ELECTRON COUPLING
ELECTRON-PHONON COUPLING
FERMI LEVEL
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANESE COMPOUNDS
MANGANESE OXIDES
PEROVSKITES
POLARONS
STRONTIUM OXIDES