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Charge Inhomogeneities in the Colossal Magnetoresistant Manganites From the Local Atomic Structure

Published online by Cambridge University Press:  10 February 2011

S. J. L. Billinge ,
V. Petkov ,
Th. Proffen ,
G. H. Kwei ,
J. L. Sarrao ,
S. D. Shastri  and
S. Kycia
S. J. L. Billinge
Affiliation:
Center for Fundamental Materials Research and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824
V. Petkov
Affiliation:
Center for Fundamental Materials Research and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824
Th. Proffen
Affiliation:
Center for Fundamental Materials Research and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824
G. H. Kwei
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
J. L. Sarrao
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
S. D. Shastri
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL
S. Kycia
Affiliation:
Cornell High Energy Synchrotron Source, Ithaca, NY
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Abstract

We have measured atomic pair distribution functions (PDF) of La1−xCaxMnO3 using high energy x-ray diffraction. This approach yields accurate PDFs with very high real-space resolution. It also avoids potential pitfalls from the more usual neutron measurements that magnetic scattering is present in the measurement, that the neutron scattering length of manganese is negative leading to partial cancellation of PDF peaks, and that inelasticity effects might distort the resulting PDF We have used this to address the following questions which do not have a satisfactory answer: (1) What are the amplitudes and natures of the local Jahn-Teller and polaronic distortions in the CMR region. (2) Is the ground-state of the ferromagnetic metallic phase delocalized or polaronic. (3) As one moves away from the ground-state, by raising temperature or decreasing doping, towards the metal insulator transition, how does the state of the material evolve?

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 177
Copyright
Copyright © Materials Research Society 2000

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