Probing perovskite manganites through resistance fluctuations

Akilan Palanisami; Neil D. Mathur; Michael B. Weissman

doi:10.1117/12.497049

9 May 2003 Probing perovskite manganites through resistance fluctuations

Akilan Palanisami, Neil D. Mathur, Michael B. Weissman

Author Affiliations +

Proceedings Volume 5112, Noise as a Tool for Studying Materials; (2003) https://doi.org/10.1117/12.497049
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

Abstract

Resistance fluctuations of low strain thin film La_0.7Ca_0.3MnO₃grown on NdGaO₃ show no dependence on low magnetic fields above T_c. At T_c, 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 T_c is seen to broaden with magnetic field. Below T_c, 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 T_c 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.

Citation Download Citation

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); https://doi.org/10.1117/12.497049

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