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APS » Journals » Phys. Rev. Lett. » Volume 77 » Issue 9
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Phys. Rev. Lett. 77, 1869–1872 (1996)

Ferromagnetic Ordering and Unusual Magnetic Ion Dynamics in La0.67Ca0.33MnO3

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R. H. Heffner, L. P. Le, M. F. Hundley, and J. J. Neumeier
Los Alamos National Laboratory, Los Alamos, New Mexico 87545

G. M. Luke, K. Kojima, B. Nachumi, and Y. J. Uemura
Department of Physics, Columbia University, New York, New York 10027

D. E. MacLaughlin
Department of Physics, University of California, Riverside, California 92521

S -W. Cheong
Bell Laboratories, Murray Hill, New Jersey 07974

Received 6 March 1996; published in the issue dated 26 August 1996

Zero-field muon spin relaxation and resistivity experiments on La0.67Ca0.33MnO3 powder show that the sublattice magnetization νμ(T) is well described for T≤Tc by (1-T/Tc)β, where β=0.345±0.015, characteristic of a second-order phase transition for a 3D spin system, and the ferromagnetic transition temperature (Tc=274 K) and resistivity peak temperature coincide to within 1 K. Below TCνμ and the zero-field resistivity ρ are correlated, with νμ∝-lnρ. 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.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.1869
DOI:
10.1103/PhysRevLett.77.1869
PACS:
75.30.-m, 72.80.Ga, 75.40.Gb, 76.75.+i
 
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