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Published November 2, 2005 | Published
Journal Article Open

The electron glass in a switchable mirror: relaxation, ageing and universality

Abstract

The rare earth hydride YH_(3−δ) can be tuned through the metal–insulator transition both by changing δ and by illumination with ultraviolet light. The transition is dominated by strong electron–electron interactions, with transport in the insulator sensitive to both a Coulomb gap and persistent quantum fluctuations. Via a systematic variation of UV illumination time, photon flux, carrier density, and temperature, we demonstrate that polycrystalline YH_(3−δ) serves as a model system for studying the properties of the interacting electron glass. Prominent among its features are logarithmic relaxation, ageing, and universal scaling of the conductivity.

Additional Information

© 2005 IOP Publishing. Received 18 July 2005, in final form 30 August 2005. Published 14 October 2005. We are indebted to R Griessen for introducing us to the fascinating properties of the rare earth hydrides. The work at the University of Chicago was supported by the National Science Foundation under grant No DMR-0114798.

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