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Title: Electronic tuning of two metals and colossal magnetoresistances in EuWO1+ xN2- x perovskites
Authors: Yang, Minghui
Oro-Sole, Judith
Kusmartseva, Anna F.
Fuertes, Alba
Attfield, J. Paul
Issue Date: 2010
Publisher: © American Chemical Society
Citation: YANG, M. ... et al, 2010. Electronic tuning of two metals and colossal magnetoresistances in EuWO1+ xN2- x perovskites. Journal of the American Chemical Society, 132 (13), pp. 4822 - 4829.
Abstract: A remarkable electronic flexibility and colossal magnetoresistance effects have been discovered in the perovskite oxynitrides EuWO1+xN 2-x. Ammonolysis of Eu2W2O9 yields scheelite-type intermediates EuWO4-yNy with a very small degree of nitride substitution (y = 0.04) and then EuWO1+xN 2-x perovskites that show a wide range of compositions -0.16 < x < 0.46. The cubic lattice parameter varies linearly with x, but electron microscopy reveals a tetragonal superstructure. The previously unobserved x < 0 regime corresponds to oxidation of Eu (hole doping of the Eu:4f band), whereas x > 0 materials have chemical reduction of W (electron doping of the W:5d band). Hence, both the Eu and W oxidation states and the hole/electron doping are tuned by varying the O/N ratio. EuWO1+xN2-x phases order ferromagnetically at 12 K, and colossal magnetoresistances (CMR) are observed in the least doped (x = -0.04) sample. Distinct mechanisms for the hole and electron magnetotransport regimes are identified. © 2010 American Chemical Society.
Description: This article is closed access.
Sponsor: This work was supported by the Ministerio de Ciencia e Innovacio´n (grants MAT2008-04587 and PR2008- 0164) and the Generalitat de Catalunya, Spain, and EPSRC, the Royal Society, EaStCHEM, and the Leverhulme Trust, U.K.
Version: Published
DOI: 10.1021/ja910745b
URI: https://dspace.lboro.ac.uk/2134/17365
Publisher Link: http://dx.doi.org/10.1021/ja910745b
ISSN: 0002-7863
Appears in Collections:Closed Access (Physics)

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