Hall-Effect Sign Anomaly and Small-Polaron Conduction in (La{sub 1-{ital x}}Gd{sub {ital x}}){sub 0.67}Ca{sub 0.33}MnO{sub 3}

Journal Article · Fri Jan 31 23:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.951· OSTI ID:450451

Jaime, M; Hardner, H; Salamon, M ^[1]; Salamon, M ^[2]; Rubinstein, M; Dorsey, P ^[3]; Emin, D ^[4]

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1. Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801-3080 (United States)
2. Center for Material Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. U.S. Naval Research Laboratory, Washington, D.C. 20375-5000 (United States)
4. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

The Hall coefficient of Gd-doped La{sub 2/3}Ca{sub 1/3}MnO{sub 3} exhibits Arrhenius behavior over a temperature range from 2T{sub c} to 4T{sub c}, with an activation energy very close to (2)/(3) that of the electrical conductivity. Although both the doping level and thermoelectric coefficient indicate holelike conduction, the Hall coefficient is electronlike. This unusual result provides strong evidence in favor of small-polaronic conduction in the paramagnetic regime of the manganites. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Sandia National Laboratory
• DOE Contract Number: AC04-94AL85000; FG02-91ER45439
• OSTI ID: 450451
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
GADOLINIUM OXIDES
HALL EFFECT
LANTHANUM OXIDES
MANGANESE OXIDES
PARAMAGNETISM
POLARONS
TEMPERATURE DEPENDENCE
THERMOELECTRIC PROPERTIES