Abstract
The influence of the Y doping on the magnetic properties of La0.7.xYxCa0.3MnO3 compounds (x = 0 ; 0.07 ; 0.1 ; 0.15) and on the low field and high field magnetoresistance responses is first investigated by means of transport, susceptibility and magnetisation measurements. It is shown that at low field the variations at 50K of the resistivity with the magnetisation are not dependent of the Y content, and that for x = 0.15 the disappearance of low field magnetoresistance is thus due to antiferromagnetic couplings leading to a low bulk magnetisation value. It is also evidenced that the high field magnetoresistance cannot be an intrinsic effect, but is related to the existence at the surface of the grain of a spin disordered layer that becomes magnetically softer with increasing yttrium content.
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Damay, F., Macmanus-Driscoll, J., Cohen, L.F. (2000). Influence of Microstructure and Magnetic State on Low Temperature Magnetoresistance Properties of Bulk LA0.7-xYxCA0.3MnO3 . In: Cloots, R., Ausloos, M., Pekala, M., Hurd, A.J., Vacquier, G. (eds) Supermaterials. NATO Science Series, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0912-6_6
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DOI: https://doi.org/10.1007/978-94-010-0912-6_6
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