Abstract
The short-range parimagnetic configurations, observed in the heavy rare-earth RCo2 compounds in paramagnetic range far above the Curie temperature T-C, consist in formation of ferromagnetic cobalt clusters antiferromagnetically coupled to the neighboring R magnetic moments. The characteristic temperature of the onset of parimagnetism T-f is very sensitive to changes of external conditions like pressure or composition.
The pressure coefficients partial derivative T-f/partial derivative p and partial derivative T-C/partial derivative p are comparable, indicating a close connection of underlying mechanisms. Our recent measurements indicate systematic evolution of the pressure coefficients with spanning the rare-earth series from Dy through Tm in RCo2 with a specific case TmCo2.