Nonlinear effects of current on transport in manganite films

被引：25
作者：
Palanisami, A
Weissman, MB
Mathur, ND
机构：
[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[2] Univ Cambridge, Dept Mat Sci, Cambridge CB2 3QZ, England
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.71.094419
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In films of La0.7Ca0.3MnO3 at current densities above about 10(4) A/cm(2) a jump in resistance is found when the average sample temperature is just below the temperature of the maximum derivative of Ohmic resistance with respect to temperature. The jump is hysteretic as a function of current, temperature, and magnetic field. The existence of the jump is consistent with simulated effects of nonuniform Joule heating. Local thermometers based on noise features provide further evidence for the nonuniform heating. However, detailed comparison of the simulated Joule effects and the data show qualitative discrepancies, possibly due to strain-induced mixed-phase texture.
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