Current jets, disorder, and linear magnetoresistance in the silver chalcogenides

Creators: Hu, Jingshi; Rosenbaum, T. F.; Betts, J. B.

Abstract

The inhomogeneous distribution of excess or deficient silver atoms lies behind the large and linear transverse magnetoresistance displayed by Ag_(2±δ)Se and Ag_(2±δ)Te, introducing spatial conductivity fluctuations with length scales independent of the cyclotron radius. We report a negative, nonsaturating longitudinal magnetoresistance up to at least 60 T, which becomes most negative where the bands cross and the effect of conductivity fluctuations is most acute. Thinning samples down to 10 μm suppresses the negative response, revealing the essential length scale in the problem and paving the way for designer magnetoresistive devices.

Additional Information

© 2005 The American Physical Society. (Received 26 May 2005; published 28 October 2005). The authors are indebted to A. Husmann, M. Parish, and P. Littlewood for illuminating discussions, to M.-L. Saboungi for her insights into the silver chalcogenides, and to Q. Guo for assistance with sample preparation. The work at the University of Chicago was supported by U.S. Department of Energy Grant No. DE-FG02-99ER45789. J.H. acknowledges support from the Consortium for Nanoscience Research. The work at the National High Magnetic Field Laboratory was carried out under the auspices of the National Science Foundation, the state of Florida, and the U.S. Department of Energy.

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Published - PhysRevLett.95.186603.pdf

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