Crystal structure and magnetic properties of the quasi-one-dimensional compound (Ca1-xYx)(0.82)CuO2 prepared at room pressure

A solid solution of the quasi-one-dimensional cuprate, (Ca1-xYx)(0.82)CuO2 with 0 less than or equal to x less than or equal to 0.435, has been succes sfully synthesized at room pressure. Upon yttrium doping (decreasing hole c oncentration), the formal Cu valence of the solid solution changes from +2. 36 to +2.00 without any significant change in the crystal structure. The so lid solution shows an evolution in magnetic behavior, from a dimerlike spin state to a long-range, magnetically ordered state. The former state can be treated as a dilute one-dimensional spin system consisting of both spin di mers (S = 0) and paramagnetic spin segments (S = 1/2).