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Phys. Rev. Lett. 78, 951–954 (1997)

Hall-Effect Sign Anomaly and Small-Polaron Conduction in (La1-xGdx)0.67Ca0.33MnO3

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M. Jaime1, H. T. Hardner1, M. B. Salamon1,2, M. Rubinstein3, P. Dorsey3, and D. Emin4
1Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801-3080
2Center for Material Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
3U.S. Naval Research Laboratory, Washington, D.C. 20375-5000
4Sandia National Laboratories, Albuquerque, New Mexico 87185

Received 13 September 1996; published in the issue dated 3 February 1997

The Hall coefficient of Gd-doped La2/3Ca1/3MnO3 exhibits Arrhenius behavior over a temperature range from 2Tc to 4Tc, 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.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.951
DOI:
10.1103/PhysRevLett.78.951
PACS:
75.50.Pp, 71.38.+i, 72.20.My
 
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