NONLINEAR PRESSURE DEPENDENCES OF THE FERRIMAGNETIC CURIE AND THE FERRIMAGNETIC-TO-ANTIFERROMAGNETIC TRANSITION-TEMPERATURES IN (CR-1-XTIX)(5)S-6

The ferrimagnetic Curie temperature (T-c) and the ferrimagnetic-to-ant iferromagnetic transition temperature (T-t) in (Cr1-xTix)(5) S-6(0 les s than or equal to x less than or equal to 0.15) were investigated up to 14 kbar. It is revealed that T-c, decreases nonlinearly with increa sing pressure (P) and that T-t also decreases at high pressures. The r atio T-t(P)/T-c(P) increases with increase in P. These nonlinear press ure dependences of T-c(P) and T-t(P) are qualitatively discussed on th e basis of the band structure calculation for CrS in which the stabili ty of antiferromagnetic states is determined by Cr3d(z2)-Cr3d(z2) and Crd-Sp interactions. Important role of Crd-Sp hybridization on the pre ssure effect is suggested.