Chemical and external pressure effects on ferromagnetic manganites

Effects of hydrostatic pressure on the ferromagnetic phase transition are systematically investigated for doped manganites, R1−xSrxMnO3 (R  La and Nd) by controlling the doping level (x). In both the systems, the positive pressure coefficient (dln Tc|dP) for the Curie temperature increases significantly with the decrease of x (or Tc). We have derive empirical relation between the coefficient and Tc, and will discuss its origin.