Charge inhomogeneities in the colossal magnetoresistant manganites from the local atomic structure

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The authors have measured atomic pair distribution functions (PDF) of La{sub 1{minus}x}Ca{sub x}MnO{sub 3} 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. They 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 ... continued below

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9 p.

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Billinge, S. J. L.; Petkov, V.; Proffen, T.; Kwei, G. H.; Sarrao, J. L.; Shastri, S. D. et al. January 12, 2000.

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The authors have measured atomic pair distribution functions (PDF) of La{sub 1{minus}x}Ca{sub x}MnO{sub 3} 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. They 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?

Physical Description

9 p.

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INIS; OSTI as DE00751878

Medium: P; Size: 9 pages

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  • MRS'99 Fall Meeting, Boston, MA (US), 11/29/1999--12/03/1999

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  • Report No.: ANL/UPD/CP-100865
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 751878
  • Archival Resource Key: ark:/67531/metadc708853

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  • January 12, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 7:31 p.m.

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Billinge, S. J. L.; Petkov, V.; Proffen, T.; Kwei, G. H.; Sarrao, J. L.; Shastri, S. D. et al. Charge inhomogeneities in the colossal magnetoresistant manganites from the local atomic structure, article, January 12, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc708853/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.