Universal Relationship between Magnetization and Changes in the Local Structure of La{sub 1-x}Ca{sub x}MnO{sub 3}: Evidence for Magnetic Dimers
- Physics Department, University of California, Santa Cruz, California 95064 (United States)
- Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
- Quantum Design Inc., 11578 Sorrento Valley Road, San Diego, California 92121-1311 (United States)
- Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, Menlo Park, California 94025 (United States)
We present extensive x-ray absorption fine structure measurements on La{sub 1-x}Ca{sub x}MnO{sub 3} as a function of the B field (to 11 T) and Ca concentration, x (21%-45%). These results reveal local structure changes (associated with polaron formation) that depend only on the magnetization for a given sample, irrespective of whether the magnetization is achieved through a decrease in temperature or an applied magnetic field. Furthermore, the relationship between local structure and magnetization depends on the hole doping. A model is proposed in which a filamentary magnetization initially develops via the aggregation of pairs of Mn atoms involving a hole and an electron site. These pairs have little distortion and it is likely that they form at temperature T{sup *} above T{sub c}.
- OSTI ID:
- 20699401
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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