Pressure effect on magnetic and magnetotransport properties of intermetallic and colossal magnetoresistance oxide compounds

The joint power of neutron diffraction and pressure techniques allows us to characterize under unique conditions th en ature and different role of basic interactions in solids. We have covere dab road phenomenology in archetypical compounds: intermetallics and magnetic oxides. We have selected compounds in which the effect of moderate pressure is able to modify the electronic structure and bond angles that in turn are in the bases of magnetic and structural transitions. Complex magnetic and structural phase diagrams are reported for compounds with magnetic (Tb1−X YX Mn2) and structural (RE5Si4−X GeX ) instabilities. Pressure-induced change of the magnetic structure in (R2Fe17) intermetallics and the effect on the colossal magnetoresistance manganites are described.