抄録
Magnetic phase diagram of the quasi-one-dimensional antiferromagnetic mixture CsMn1−xCoxCl3·2H2O has been studied through the magnetic susceptibility measurement and neutron diffraction experiment. The x-T diagram essentially consists of two parts, one for x<0.1 already reported and the other x>0.1. For x>0.1, TN increases with increasing x, reaching a broad maximum at about x=0.45 and then decreases as x approaches 1.0. Between the two different magnetic structures for x=0.1 (C-structure) and for x=1 (D-structure), a modurated structure described as antiferromagnetic chains extending in the a-direction coupled ferromagnetically along the c-direction and arrayed in an up-up-down-down manner along the b-direction has been observed.
