TY - JOUR
T1 - Field-Induced Crossover in La0,7Pb0.3MnO3
AU - Heilman, A. K.
AU - Xue, Y. Y.
AU - Lorenz, B.
AU - Gospodinov, M.
AU - Dobreva, S. G.
AU - Chu, C. W.
N1 - Funding Information:
We thankD . K. Rossa ndR Bontchevfo r the microprobaen dX RD measurementTsh. e work is supporteidn partb y NSF GrantN o. DMR 9804325, the T. L. L. Temple Foundationt,h e John and RebeccaM ooresE ndowmenatn dt heS tateo f Texas thoughT CSUH.
PY - 2000
Y1 - 2000
N2 - A field-induced crossover is observed both resistively and magnetically in a single crystal of La0.7Pb0.3MnO3, a compound that exhibits colossal magnetoresistance (CMR) and has a second-order ferromagnetic transition. The resistivity (p) data observed in high magnetic fields show a universal decrease with the magnetization (M) and little dependence on temperature. In contrast, p is independent of M for lower fields. An analysis of the magnetization data finds that the critical exponents have different values depending on whether the high field data or the low field data are analyzed. The results are consistent with the interpretation that at low fields, the compound behaves as a collection of magnetic clusters with mean-field-like inter-cluster interactions, and at high fields the compound behaves as a system of individual spins with short-range interactions.
AB - A field-induced crossover is observed both resistively and magnetically in a single crystal of La0.7Pb0.3MnO3, a compound that exhibits colossal magnetoresistance (CMR) and has a second-order ferromagnetic transition. The resistivity (p) data observed in high magnetic fields show a universal decrease with the magnetization (M) and little dependence on temperature. In contrast, p is independent of M for lower fields. An analysis of the magnetization data finds that the critical exponents have different values depending on whether the high field data or the low field data are analyzed. The results are consistent with the interpretation that at low fields, the compound behaves as a collection of magnetic clusters with mean-field-like inter-cluster interactions, and at high fields the compound behaves as a system of individual spins with short-range interactions.
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U2 - 10.1016/S0921-4534(00)00656-0
DO - 10.1016/S0921-4534(00)00656-0
M3 - Article
AN - SCOPUS:0343397170
SN - 0921-4534
VL - 341-348
SP - 707
EP - 710
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - PART 3
ER -