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Effects of Localized Holes on Charge Transport, Local Structure and Spin Dynamics in the Metallic State of CMR La1-xCaxMnO3

Published online by Cambridge University Press:  10 February 2011

R. H. Heffner ,
M. F. Hundley  and
C. H. Booth
R. H. Heffner
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
M. F. Hundley
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
C. H. Booth
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545 Physics Department, University of California, Irvine, CA 92697
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Abstract

We review resistivity, x-ray-absorption fine-structure (XAFS) and muon spin relaxation (μSR) data which provide clear evidence for localized holes causing polaron distortion and unusual spin dynamics below Tc in “colossal magnetoresistive” (CMR) La1-xCaxMnO3. Resistivity measurements for x=0.33 under an applied field H have shown that ln[ρ(H,T)] α -M, where M is the magnetization. The XAFS data show a similar functional dependence for the polaron distortions on M. The data from these two measurements are interpreted in terms of some fraction of the available holes x remaining localized and some increasing fraction becoming delocalized with increasing M. Finally, this polaron-induced spatial inhomogeneity yields anomalously slow, spatially inhomogeneous spin dynamics below Tc, as shown in the μSR data. These experiments individually probe the charge, lattice and spin degrees of freedom in this CMR system and suggest that the polarons retain some identity even at temperatures significantly below Tc.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 275
Copyright
Copyright © Materials Research Society 1998

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References

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