Colossal magnetoresistance in Sr2-xNd1+xMn2O7 (x = 0.0, 0.1)
- Battle, P.D.
- Blundell, S.J.
- Green, M.A.
- Hayes, W.
- Honold, M.
- Klehe, A.K.
- Laskey, N.S.
- Millburn, J.E.
- Murphy, L.
- Rosseinsky, M.J.
- Samarin, N.A.
- Singleton, J.
- Sluchanko, N.E.
- Sullivan, S.P.
- Vente, J.F.
DOIAbstract
Magnetization and magnetotransport measurements have been used to study the composition dependence of the electronic properties of the Ruddlesden-Popper phases Sr2NdMn2O7 and Sr1.9Nd1.1Mn2O7. Although their behaviour differs in detail, both compounds show a colossal magnetoresistance (CMR) effect (>10 000% in 14 T) in the temperature range 4.2 ? T/K ? 100. However, neither material shows a transition to a ferromagnetic state above 4.2 K, and both materials have higher resistivities (>103 ? cm for 4.2 ? T/K ? 100) than the metallic oxides previously found to show CMR. In view of the low conductivity and the absence of ferromagnetism, the CMR of these phases is not readily explained by a doubleexchange mechanism
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