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Experimental Determination of the key Energy Scales in the Colossal Magnetoresistive Manganites

Published online by Cambridge University Press:  10 February 2011

D. S. Dessau ,
T. Saitoh ,
C.-H. Park ,
Z.-X. Shen ,
Y. Moritomo  and
Y. Tokura
D. S. Dessau
Affiliation:
Department of Physics, University of Colorado, CO 80309
T. Saitoh
Affiliation:
Department of Physics, University of Colorado, CO 80309
C.-H. Park
Affiliation:
Department of Applied Physics, Stanford University, Stanford, CA 94305
Z.-X. Shen
Affiliation:
Department of Applied Physics, Stanford University, Stanford, CA 94305
Y. Moritomo
Affiliation:
Department of Applied Physics, University of Tokyo, Tokyo 113, Japan and Joint Research Center for Atom Technology (JRCAT), Tsukuba, Ibaraki 305, Japan
Y. Tokura
Affiliation:
Department of Applied Physics, University of Tokyo, Tokyo 113, Japan and Joint Research Center for Atom Technology (JRCAT), Tsukuba, Ibaraki 305, Japan
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Abstract

We have performed X-ray absorption (XAS) and angle-resolved photoemission (ARPES) on single crystals of both the layered and cubic colossal magnetoresistive manganites to determine the electronic structure and the relevant energy scales in the problem: the intra-atomic exchange energy J (∼ 2.7 eV), the Jahn-Teller energy gain EJ-T (<.25 eV), the one-electron bandwidth W (>3 eV for layered compounds) and the lattice relaxation or polaron binding energy EB (.65 eV ferromagnetic phase and.8 eV paramagnetic phase). Lattice polarons are deemed important especially in the paramagnetic but also to a degree in the ferromagnetic phase. Due to the energy scale mismatch, the Jahn-Teller effect is unlikely to be the cause for these lattice polarons, at least for the layered samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 181
Copyright
Copyright © Materials Research Society 1998

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References

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