Nonlinear pressure dependence of TN in almost multiferroic EuTiO sub(3)

The antiferromagnetic (AFM) phase transition temperature T sub(N) of EuTiO sub(3) has been studied as a function of pressure p. The data reveal a nonlinear dependence of T sub(N) on p with T sub(N) increasing with increasing pressure. The exchange interactions exhibit an analogous dependence on p as T sub(N) (if the absolute value of the nearest neighbor interaction is considered) and there is evidence that the AFM transition is robust with increasing pressure. The corresponding Weiss temperature [Theta] sub(W) remains anomalous since it always exhibits positive values. The data are analyzed within the Bloch power law model and provide excellent agreement with experiment.