Negative magnetoresistance in a V3+/V4+ mixed valent vanadate

Maignan, A.; Lebedev, O. I.; Van Tendeloo, G.; Martin, C.; Hébert, S.
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p232502
Academic Journal
The magnetotransport and magnetic properties of the PbV6O11 vanadate, crystallizing in the P63mc space group, reveal the existence of a negative magnetoresistance related to its ferromagnetic state (TC∼90 K). The maximum effect is observed at 20 K reaching -30% in 9 T. The structural study of this ceramic reveals a V/Pb ratio smaller than expected from the formula. This is explained by the presence of numerous stacking faults observed by high resolution transmission electron microscopy. The existence of these planar defects acting as resistive barriers along the c axis could be responsible for tunneling magnetoresistance.


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