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Originally published in Science Express on 19 September 2002
Science 25 October 2002:
Vol. 298. no. 5594, pp. 805 - 807
DOI: 10.1126/science.1077346
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Reports
Direct Observation of Percolation in a Manganite Thin Film
Liuwan Zhang,1*
Casey Israel,1*
Amlan Biswas,2
R. L. Greene,2
Alex de Lozanne1§
Upon cooling, the isolated ferromagnetic domains in thin films of
La0.33Pr0.34Ca0.33MnO3
start to grow and merge at the metal-insulator transition temperature
TP1, leading to a steep drop in resistivity, and
continue to grow far below TP1. In contrast,
upon warming, the ferromagnetic domain size remains unchanged until
near the transition temperature. The jump in the resistivity results
from the decrease in the average magnetization. The ferromagnetic
domains almost disappear at a temperature TP2
higher than TP1, showing a local magnetic
hysteresis in agreement with the resistivity hysteresis. Even well
above TP2, some ferromagnetic domains with higher transition temperatures are observed, indicating magnetic inhomogeneity. These results may shed more light on the origin of the
magnetoresistance in these materials.
1 Department of Physics, University of Texas,
Austin, TX 78712, USA.
2 Center for
Superconductivity Research, Department of Physics, University of
Maryland, College Park, MD 20742, USA.
*
These authors contributed equally to this work.
Permanent address: Department of Physics, Tsinghua
University, Beijing 100084, People's Republic of China.
Present address: Department of Physics, University of
Florida, Gainesville, FL 32611-8440, USA.
§
To whom correspondence should be addressed. E-mail:
lozanne{at}physics.utexas.edu
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Science
318, 1750-1753
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