PRESSURE EFFECTS ON NANOSTRUCTURED MANGANITES

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

PHYSICA B - CONDENSED MATTER

Elsevier

Lugar: Amsterdam; Año: 2007 vol. 398 p. 212 - 214

0921-4526

We have measured the pressure sensitivity of magnetic properties on La5 =8 y Pr y Ca3 =8 MnO3a5 =8 y Pr y Ca3 =8 MnO Samples were synthesized following a microwave assisted denitration process and a .nal heat treatment at different 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 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.