Large magnetoresistances and non-Ohmic conductivity in EuWO1+xN2-x

Kusmartseva, A.; Yang, M.; Oró-Solé, J.; Bea, A. M.; Fuertes, A.; Attfield, J. P.
July 2009
Applied Physics Letters;7/13/2009, Vol. 95 Issue 2, p022110
Academic Journal
The magnetic field and voltage dependent electronic transport properties of EuWO1+xN2-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.


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