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9 May 2003 Probing perovskite manganites through resistance fluctuations
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Proceedings Volume 5112, Noise as a Tool for Studying Materials; (2003)
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States
Resistance fluctuations of low strain thin film La0.7Ca0.3MnO3grown on NdGaO3 show no dependence on low magnetic fields above Tc. At Tc, small volume local phase fluctuations are probed using the variance of the resistance noise power to give an upper bound fluctuator size scale of 100nm. The resistance noise peak at Tc is seen to broaden with magnetic field. Below Tc, comparison of the thermodynamics with the transport effects of large two state resistance fluctuations indicate large current inhomogeneity. Their behavior is similar to local phase fluctuations seen on higher strain films. The sample resistance below Tc is shown not to be a unique function of the bulk sample magnetization through a fluctuation-dissipation argument. Evidence for low temperature aging in the resistance noise power is also presented.
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Akilan Palanisami, Neil D. Mathur, and Michael B. Weissman "Probing perovskite manganites through resistance fluctuations", Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003);

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