Ferromagnetic Ordering and Unusual Magnetic Ion Dynamics in La{sub 0.67}Ca{sub 0.33}MnO{sub 3}
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Department of Physics, Columbia University, New York, New York 10027 (United States)
- Department of Physics, University of California, Riverside, California 92521 (United States)
- Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
Zero-field muon spin relaxation and resistivity experiments on La{sub 0.67}Ca{sub 0.33}MnO{sub 3} powder show that the sublattice magnetization {nu}{sub {mu}}({ital T}) is well described for {ital T}{le}{ital T}{sub {ital c}} by (1{minus}{ital T}/{ital T}{sub {ital c}}){sup {beta}} , where {beta}=0.345{plus_minus}0.015, characteristic of a second-order phase transition for a 3D spin system, and the ferromagnetic transition temperature ({ital T}{sub {ital c}}=274 K) and resistivity peak temperature coincide to within 1K. Below {ital T}{sub {ital C}} {nu}{sub {mu}} and the zero-field resistivity {rho} are correlated, with {nu}{sub {mu}}{proportional_to}{minus}ln{rho}. Unusual relaxational dynamics suggest spatially inhomogeneous Mn-ion correlation times. These results are discussed in terms of the possible effects of polarons on the spin and charge dynamics. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 396615
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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