Magnetotransport in Manganites and the Role of Quantal Phases: Theory and Experiment

S. H. Chun, M. B. Salamon, Y. Lyanda-Geller, P. M. Goldbart, and P. D. Han
Phys. Rev. Lett. 84, 757 – Published 24 January 2000
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Abstract

While low-temperature Hall resisitivity ρxy of La2/3(Ca,Pb)1/3MnO3 single crystals can be separated into ordinary (OHE) and anomalous (AHE) contributions, no such decomposition is possible near the Curie temperature Tc. Rather, the ρxy data collapse to a single function of the reduced magnetization m=M/Msat, with an extremum at 0.4m. A new mechanism for the AHE in the inelastic hopping regime is identified that reproduces the scaling curve. An extension of Holstein's model for the hopping OHE, the mechanism arises from the combined effects of the double-exchange-induced quantal phase in triads of Mn ions and spin-orbit interactions.

  • Received 20 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.757

©2000 American Physical Society

Authors & Affiliations

S. H. Chun*, M. B. Salamon, Y. Lyanda-Geller, P. M. Goldbart, and P. D. Han

  • Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080

  • *Present address: Department of Physics, The Pennsylvania State University, University Park, PA 16802.

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Vol. 84, Iss. 4 — 24 January 2000

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