Direct Relationship between Magnetism and MnO{sub 6} Distortions in La{sub 1{minus}{ital x}}Ca{sub {ital x} }MnO{sub 3}
- Department of Physics and Astronomy, University of California, Irvine, California 92697 (United States)
- Physics Department, University of California, Santa Cruz, California 95064 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Measured distortions of the Mn-O bond length distribution from x-ray-absorption fine-structure measurements are found to relate linearly to the doped hole concentration x at room temperature in La{sub 1{minus}x}Ca{sub x}MnO{sub 3}. Comparison of the distortions above and below T{sub c} for colossal magnetoresistor (CMR) samples gives an estimate of the number of delocalized holes n{sub dh}, and we find that ln(n{sub dh}){proportional_to}M (magnetization). These results are complementary to resistance measurements that show that ln({rho}){proportional_to}{minus}M . We have thus established the functional relationship between the electronic, spin, and lattice degrees of freedom in the CMR perovskites. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573909
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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