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"Pressure effects on nanostructured manganites"
C. Acha, G. Garbarino and A.G. Leyva
Proc. of the Workshop "At the Frontiers of Condensed Matter III - New Trends in Structural, Electronic and Magnetic Properties of Matter", Centro Atómico Constituyentes-CNEA, Buenos Aires, Argentina, December 11-15, 2006. Ed. J. Guevara, A.M. Llois, G. Lozano and R. Weht
Physica B Condens. Matter. 398(2) (2007) 212-214
We have measured the pressure sensitivity of magnetic properties on La5/8-yPryCa3/8MnO3 (y = 0.3) nanostructured powders. Samples were synthesized following a microwave assisted denitration process and a final heat treatment at different temperatures to control the grain size of the samples. A span in grain diameters from 40 nm to ~1000nm was obtained. Magnetization curves as a function of temperature were measured following different thermomagnetic histories. AC susceptibility as a function of temperature was also measured at different hydrostatic pressures (up to 10 kbar) and for different frequencies. Our results indicate that the nanostructuration plays a role of an internal pressure, producing a structural deformation with similar effects to those obtained under an external hydrostatic pressure.
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