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Microwave surface resistance of colossal magnetoresistance manganites

Publication Type

Journal Article

Authors

Lofland, S.E., P.H. Kim, P. Dahiroc, S.M. Bhagat, S.D. Tyagi, C. Kwon, R. Shreekala, Ramamoorthy Ramesh, T. Venkatesan

Abstract

We present here a systematic study of the microwave surface resistance Rs of both ceramic and single-crystal colossal magnetoresistance manganites over both a large (2-60 GHz) frequency and a wide (77-400 K) temperature range. In many cases, Rs shows an anomalous dip just below the Curie point which has no analogous feature in the dc resistivity ρ. This minimum shifts in temperature with both frequency and application of a magnetic field. We demonstrate that this 'anomaly' is a consequence of the dynamics of a conducting ferromagnet and holds promise for use in developing new microwave devices. In addition, high-resistivity material shows an inversion effect in Rs. That is, Rs varies as ρ-1/2 rather than ρ1/2, the conventional result for a bulk conductor. This phenomenon eludes a complete explanation.

Journal

Journal of Physics Condensed Matter

Volume

Year of Publication

1997

ISSN

09538984

Notes

cited By 26

Research Areas

Ramesh Lab