L. Ranno et al., TRANSPORT AND MAGNETIC-PROPERTIES OF A(1-X)(3+)B(X)(2+)MNO(3) (A=LA,YOR ND,B=CA,SR OR BA) MAGNETIC PEROVSKITES, Journal of magnetism and magnetic materials, 158, 1996, pp. 291-292
A(x)(3+)B(1-x)(2+)MnO(3) perovskites have striking magneto-resistance
properties showing effects close to - 100% in fields of a few tesla in
some cases. When x = 0.3, magnetic and transport properties are quali
tatively similar with a resistivity peak below T-c, but there are enor
mous quantitative differences depending on the A and B cations present
.