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1/f electrical noise in epitaxial thin films of the manganite oxides La0.67Ca0.33MnO3 and Pr0.67Sr 0.33MnO3

Publication Type

Journal Article

Authors

Rajeswari, M., A. Goyal, A.K. Raychaudhuri, M.C. Robson, G.C. Xiong, C. Kwon, Ramamoorthy Ramesh, R.L. Greene, T. Venkatesan, S. Lakeou

Abstract

We report measurements of 1/f electrical noise in two hole doped manganite perovskite oxides, La0.67Ca0.33MnO3 and Pr 0.67Sr0.33MnO3, 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 YBa2Cu3O 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. © 1996 American Institute of Physics. [S0003-6951(96)02932- 4].

Journal

Applied Physics Letters

Year of Publication

1995

ISSN

00036951

Notes

cited By 1

Research Areas

Ramesh Lab