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Ferromagnetic Ordering and Unusual Magnetic Ion Dynamics in La{sub 0.67}Ca{sub 0.33}MnO{sub 3}

Journal Article · · Physical Review Letters
; ; ;  [1]; ; ; ;  [2];  [3];  [4]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Department of Physics, Columbia University, New York, New York 10027 (United States)
  3. Department of Physics, University of California, Riverside, California 92521 (United States)
  4. 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