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

S. J.L. Billinge, V. Petkov, Th Proffen, G. H. Kwei, J. L. Sarrao, S. D. Shastri, S. Kycia

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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?

Original languageEnglish
Pages (from-to)177-182
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume602
StatePublished - 2000

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