Zero‐field μ+SR study of the colossal magnetoresistance material La0.67Ca0.33MnO3 |
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| Authors: | RH Heffner LP Le MF Hundley JJ Neumeier GM Luke K Kojima B Nachumi YJ Uemura DE Maclaughlin S‐W Cheong |
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| Institution: | (1) Los Alamos National Laboratory, Los Alamos, NM 87545, USA;(2) Department of Physics, Columbia University, New York, NY 10027, USA;(3) University of California, Riverside, CA 92521, USA;(4) Bell Laboratories, Murray Hill, NJ 07974, USA |
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| Abstract: | Zero‐field μ+SR and resistivity experiments on La0.67Ca0.33MnO3 powder show that the ferromagnetic transition temperature (TC=274\ K) and resistivity peak temperature coincide to within 1 K, about 10 K higher than TC determined from the bulk magnetization. The sublattice magnetization \nu_μ(T) is well described for T ≤ TC by (1-T/TC)β , where β =0.345 ± 0.015. Unusual relaxation dynamics suggest a wide distribution of Mn‐ion correlation times. These results
are discussed in terms of the effects of polarons on the spin and charge dynamics.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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