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1/ f electrical noise in epitaxial thin films of the manganite oxides $La_0_._6_7Ca_0_._3_3MnO_3$ and $Pr_0_._6_7Sr_0_._3_3MnO_3$

Rajeswari, M and Goyal, A and Raychaudhuri, AK and Robson, MC and Xiong, GC and Kwon, C and Ramesh, R and Greene, RL and Venkatesan, T and Lakeou, S (1996) 1/ f electrical noise in epitaxial thin films of the manganite oxides $La_0_._6_7Ca_0_._3_3MnO_3$ and $Pr_0_._6_7Sr_0_._3_3MnO_3$. In: Applied Physics Letters, 69 (6). pp. 851-853.

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Abstract

We report measurements of 1/f electrical noise in two hole doped manganite perovskite oxides, $La_0_._6_7Ca_0_._3_3MnO_3$ and $Pr_0_._6_7Sr_0_._3_3MnO_3$, which exhibit colossal magnetoresistance. The noise magnitude represented by the Hooge parameter is nearly 8 orders of magnitude larger than that observed in ordinary metals (and semiconductors) and nearly 5–6 orders of magnitude larger than that observed in epitaxial films of the perovskite oxide $YBa_2Cu_3O_7$ in the normal state. The normalized noise spectral density increases with decreasing temperature below the resistivity peak, suggestive of the presence of additional low energy noise processes in the ferromagnetic metallic state.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Institute of Physics (AIP).
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Apr 2005
Last Modified: 19 Sep 2010 04:18
URI: http://eprints.iisc.ernet.in/id/eprint/3069

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