„« PRESSURE EFFECTS ON NANOSTRUCTURED MANGANITES,

C. ACHA, G. GARBARINO AND A. G. LEYVA

Buenos Aires, Argentina

Conferencia; At the Frontiers of Condensed Matter III; 2006

CNEA

We have measured the pressure sensitivity of magnetic properties on La5=8¡yPryCa3=8MnO3 (y=0.3) nanostruc- tured powders. Samples were synthesized following a microwave assisted denitration process and a ¡Ânal heat treat- ment at di®erent temperatures to control the grain size of the samples. A span in grain diameters from 40 nm to »5=8¡yPryCa3=8MnO3 (y=0.3) nanostruc- tured powders. Samples were synthesized following a microwave assisted denitration process and a ¡Ânal heat treat- ment at di®erent temperatures to control the grain size of the samples. A span in grain diameters from 40 nm to »» 1000 nm was obtained. Magnetization curves as a function of temperature were measured following di®erent ther- momagnetic histories. AC susceptibility as a function of temperature was also measured at di®erent hydrostatic pressures (up to 10 kbar) and for di®erent frequencies. Our results indicate that the nanostructuration plays a role of an internal pressure, producing a structural deformation with similar e®ects to those obtained under an external hydrostatic pressure.