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Electron correlation and disorder in Hg_(1-x)Cd_xTe in a magnetic field

Field, Stuart B. and Reich, D. H. and Rosenbaum, T. F. and Littlewood, P. B. and Nelson, D. A. (1988) Electron correlation and disorder in Hg_(1-x)Cd_xTe in a magnetic field. Physical Review B, 38 (3). pp. 1856-1864. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:20140707-163039401

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Abstract

We report both linear and nonlinear magnetoconductance measurements on two different density samples of similar stoichiometry Hg_(1-x)Cd_xTe for 0.01<T<2.5 K and 0<H<80 kOe. The critical magnetic field for driving the samples through the metal-insulator transition is proportional to temperature at low T and saturates at T∼2 K, in quantitative agreement with a theory for the melting of a Wigner crystal in magnetic field. In the insulating state, we observe a non-Ohmic I-V characteristic at threshold electric fields less than 1 mV/cm. By analogy to theories for charge-density-wave depinning, we estimate that the electrons are correlated over regions of a few hundred lattice spacings. Finally, we map out the phase boundary between the low-T–high-H electron solid and the high-T–low-H correlated fluid, explicitly demonstrating the necessity of millikelvin temperatures for studying the relative roles of disorder and Coulomb interactions in the electron solid.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevB.38.1856DOIArticle
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.38.1856PublisherArticle
Alternate Title:Electron correlation and disorder in Hg1-xCdxTe in a magnetic field
Additional Information:© 1988 The American Physical Society. Received 6 October 1987. The work at The University of Chicago was supported by the National Science Foundation under Grant No. DMR85-17478. One of us (T.F.R) acknowledges support from the Alfred P. Sloan Foundation.
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Funding AgencyGrant Number
NSFDMR85-17478
Alfred P. Sloan FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20140707-163039401
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140707-163039401
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47029
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Jul 2014 16:43
Last Modified:09 Jul 2014 16:43

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