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Large magnetoresistance in non-magnetic silver chalcogenides

Xu, R. and Husmann, A. and Rosenbaum, T. F. and Saboungi, M.-L. and Enderby, J. E. and Littlewood, P. B. (1997) Large magnetoresistance in non-magnetic silver chalcogenides. Nature, 390 (6655). pp. 57-60. ISSN 0028-0836. doi:10.1038/36306.

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Several materials have been identified over the past few years as promising candidates for the development of new generations of magnetoresistive devices. These range from artificially engineered magnetic multilayers' and granular alloys, in which the magnetic-field response of interfacial spins modulates electron transport to give rise to 'giant' magnetoresistance, to the manganite peravskites, in which metal-insulator transitions driven by a magnetic field give rise to a `colossal' magnetoresistive response (albeit at very high fields). Here we describe a hitherto unexplored class of magnetoresistive compounds, the silver chalcogenides. At high temperatures, the compounds Ag_2S, Ag_2Se and Ag_2Te are superionic conductors; below similar to 400 K, ion migration is effectively frozen and the compounds are non-magnetic semiconductors that exhibit no appreciable magnetoresistance. We show that slightly altering the stoichiometry can lead to a marked increase in the magnetic response. At room temperature and in a magnetic field of similar to 55 kOe, Ag_(2+δ)Se and Ag_(2+δ)Te show resistance increases of up to 200%, which are comparable with the colossal-magnetoresistance materials. Moreover, the resistance of our most responsive samples exhibits an unusual linear dependence on magnetic field, indicating both a potentially useful response down to fields of practical importance and a peculiarly long length scale associated with the underlying mechanism.

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Additional Information:© 1997 Macmillan Publishers. Received 9 May 1997; Accepted 27 August 1997. We thank D. L. Price and B. J. Wuensch for discussions. The work at the University of Chicago was supported primarily by the MRSEC Program of the National Science Foundation. The work 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:6655
Record Number:CaltechAUTHORS:20140707-163032859
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46982
Deposited By: George Porter
Deposited On:08 Jul 2014 22:52
Last Modified:10 Nov 2021 17:32

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