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Lattice Effects in Perovskite and Pyrochlore CMR Materials

Published online by Cambridge University Press:  15 February 2011

G.H. Kwei ,
D.N. Argyriou ,
S.J.L. Billinge ,
A.C. Lawson ,
J.J. Neumeier ,
A.P. Ramirez ,
M.A. Subramanian  and
J.D. Thompson
G.H. Kwei
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, ghk@lanl.gov
D.N. Argyriou
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
S.J.L. Billinge
Affiliation:
Department of Physics and Astronomy and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824
A.C. Lawson
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
J.J. Neumeier
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
A.P. Ramirez
Affiliation:
Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974
M.A. Subramanian
Affiliation:
Dupont Central Research and Development. Experimental Station, Wilmington, DE 19880
J.D. Thompson
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

Colossal magnetoresistance (CMR) in doped lanthanum manganite thin films (Lai.xMx, where M is a divalent ion) has been shown to result in a factor of 106 suppression of the resistance. The driving force for the CMR transition is thought to be the double-exchange (DE) interaction. Many studies of both the crystal structure and the local structure of the Lai.xMxMnO3 (with M = Ca, Sr and Ba, as well as Pb) system have now been carried out. As expected, these systems all show a strong coupling of the lattice to the CMR transition. On the other hand, neutron diffraction data and x-ray absorption studies for the Ti2mn2O7 pyrochlore, which also exhibits CMR, shows no deviations from ideal stoichiometry, mixed valency, or Jahn-Teller distortions of the MnO6 octahedron. We present results of crystallographic and local structural studies of these two important classes of CMR materials. compare the differences in structural response, and discuss the implications of these findings to our understanding of these materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 475: Symposium M – Magnetic Ultrathin Films, Multilayers, and Surfaces – 1997 , 1997 , 533
Copyright
Copyright © Materials Research Society 1997

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