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Successive Magnetic Phase Transitions of CucCo1-cCl2-FeCl3 Graphite bi-intercalation Compounds

Abstract CucCo1-cCl2-FeCl3 graphite bi-intercalation compounds (GBIC's) have a c-axis stacking sequence of -G-I1-G-I2-G-I1-G-I2-G- (G = graphite layer, I1 = CucCo1-cCl2 layer, and I2 = FeCl3 layer). These compounds undergo magnetic phase transitions at Th, Tcu, Tcl, TSG, and TRSG (Th>Tcl>TRSG=TSG). depending on the Cu concentration. The phase transition at Th is related to a helical spin order. The phase transitions at Tcu and Tcl are associated with a spin order of CucCo1-cCl2 layers. The re-entrant spin glass phase below TRSG for c≤0.4 and the spin glass phase below TSG for c≥0.5 are due to the spin frustration effect occurring in FeCl3 layers. The nature of these phases has been studied using SQUID DC magnetization and SQUID AC magnetic susceptibility.