Megagauss sensors

A. Husmann, J. B. Betts, G. S. Boebinger, A. Migliori, T. F. Rosenbaum () and M.-L. Saboungi
Additional contact information
A. Husmann: The University of Chicago
J. B. Betts: Los Alamos National Laboratory
G. S. Boebinger: Los Alamos National Laboratory
A. Migliori: Los Alamos National Laboratory
T. F. Rosenbaum: The University of Chicago
M.-L. Saboungi: Argonne National Laboratory

Nature, 2002, vol. 417, issue 6887, 421-424

Abstract: Abstract 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, Ag2Se and Ag2Te, 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 silver1,2,3,4. Here we show that the resistance of Ag2Se 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 field range make the silver chalcogenides attractive as magnetic-field sensors, especially in physically tiny megagauss (106 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 origin5,6 for this material's unprecedented behaviour.

Date: 2002
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DOI: 10.1038/417421a

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