Large magnetoresistances and non-Ohmic conductivity in EuWO[1+x]N[2-x]
journal contributionposted on 02.08.2016 by Anna Kusmartseva, Minghui Yang, Judith Oro-Sole, A.M. Bea, Alba Fuertes, J. Paul Attfield
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The magnetic field and voltage dependent electronic transport properties of EuWO[1+x]N[2-x] ceramics are reported. Large negative magnetoresistances are observed at low temperatures, up to 70% in the least doped (x=0.09) material. Non-Ohmic conduction emerges below the 12 K Curie transition. This is attributed to a microstructure of ferromagnetic conducting and antiferromagnetic insulating regions resulting from small spatial fluctuations in the chemical doping.
This work was supported by the Ministerio de Ciencia e Innovacion Grant Nos. MAT2008-04587 and PR2008-0164 and the Generalitat de Catalunya, Spain, and the Royal Society, EPSRC, and the Leverhulme Trust, U.K.