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Megagauss sensors

Husmann, A. and Betts, J. B. and Boebinger, G. S. and Migliori, A. and Rosenbaum, T. F. and Saboungi, M.-L. (2002) Megagauss sensors. Nature, 417 (6887). pp. 421-424. ISSN 0028-0836. doi:10.1038/417421a.

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Magnetic fields change the way that electrons move through solids. The nature of these changes reveals information about the electronic structure of a material and, in auspicious circumstances, can be harnessed for applications. The silver chalcogenides, Ag_2Se and Ag_2Te, are non-magnetic materials, but their electrical resistance can be made very sensitive to magnetic field by adding small amounts-just 1 part in 10, 000-of excess silver. Here we show that the resistance of Ag_2Se displays a large, nearly linear increase with applied magnetic field without saturation to the highest fields available, 600,000 gauss, more than a million times the Earth's magnetic field. These characteristics of large (thousands of per cent) and near-linear response over a large letters to nature field range make the silver chalcogenides attractive as magnetic-field sensors, especially in physically tiny megagauss (10^6 G) pulsed magnets where large fields have been produced but accurate calibration has proved elusive. High-field studies at low temperatures reveal both oscillations in the magnetoresistance and a universal scaling form that point to a quantum origin for this material's unprecedented behaviour.

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Additional Information:© 2002 Nature Publishing Group. Received 17 December 2001; accepted 2 April 2002. We thank H. Hwang, L. P. Kadanoff and H. S. Schnyders for discussions, and the late R. Xu for technical assistance. The work at the University of Chicago and at Argonne National Laboratory was supported by DOE Basic Energy Sciences.
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Department of Energy (DOE) Office of Basic Energy SciencesUNSPECIFIED
Issue or Number:6887
Record Number:CaltechAUTHORS:20140707-163030217
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46963
Deposited By: George Porter
Deposited On:14 Jul 2014 16:18
Last Modified:10 Nov 2021 17:32

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