Physics – Condensed Matter – Materials Science
Scientific paper
2003-03-20
Physics
Condensed Matter
Materials Science
12 pages, 3 figures, first submitted to submitted to J. Phys. D; applied physics on 18th march 2003
Scientific paper
10.1063/1.1641515
Single crystals of Nd0.5Ca0.5MnO3 and Pr0.6Ca0.4MnO3 show current-induced insulator-metal transitions at low temperatures. In addition, the charge-ordering transition temperature decreases with increasing current. The electroresistive ratio, defined as r0.5/rI where r0.5 is the resistivity at a current of 0.5 mA and rI the resistivity at a given applied current, I, varies markedly with temperature and the value of I. Thermal hysteresis observed in Nd0.5Ca0.5MnO3 and Pr0.6Ca0.4MnO3 at the insulator-metal transition indicates that the transition is first-order. The current-induced changes are comparable to those induced by magnetic fields, and the insulator-metal transition in Pr0.6Ca0.4MnO3 is accordingly associated with a larger drop in resistivity.
Parashar Sachin
Raju A. R.
Rao C. N. R.
Sudheendra L.
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