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There have been various important theoretical studies for two dimensional (2D) systems over the years. Only in recent years has a wide variety of 2D systems become available for detailed experimental study so that the relevance of various theoretical ideas could be assessed. Graphite intercalation compounds (GIC’s) form a class of materials whose dimensionality can be systematically controlled by its stage number (the number of graphite layers between adjacent intercalate layers). The research interest on the influence of dimensionality has naturally centered around GIC's. Considerably improved understanding of these compounds has led to more and more use of GIC's as a testing ground for physical phenomena in low dimensional systems, including the area of crossover physics from 3D to 2D behavior.
We have been doing our research on the magnetic properties of magnetic ternary GIC’s such as random-mixture GIC’s (RMGIC’s) and graphite bi-intercalation compounds (GBIC’s) at the Department of Physics, SUNY-Binghamton since 1986. The magnetic random mixture graphite intercalation compounds (RMGIC’s) are novel types of GIC's, where the intercalate layer is formed of a random mixture of two kinds of intercalants. The magnetic graphite bi-intercalation compounds (GBIC’s) offer possibilities for the formation of superlattices such as two different magnetic intercalate layers separated by a single graphite layer. The GBIC has a stacking sequence of GI1GI2GI1GI2 along the c-axis, where two different intercalate layers (I1 and I2) alternate with a single graphite layer (G). Both magnetic RMGIC’s and GBIC’s provide model systems for studying magnetic phase transitions arising from various kinds of spin frustration effects: (i) spin glass and reentrant ferromagnet (stage-2 CucCo1-cCl2 GIC's and CocCo1-cCl2-FeCl3 GBIC’s), (ii) random field effect, (iii) 2D percolation behavior, (iv) 2D Ising antiferromagnet on the triangular lattice (CuCl2 GIC, MnCl2 GIC), and so on.
We have been doing our research on the magnetic properties of magnetic ternary GIC’s such as random-mixture GIC’s (RMGIC’s) and graphite bi-intercalation compounds (GBIC’s) at the Department of Physics, SUNY-Binghamton since 1986. The magnetic random mixture graphite intercalation compounds (RMGIC’s) are novel types of GIC's, where the intercalate layer is formed of a random mixture of two kinds of intercalants. The magnetic graphite bi-intercalation compounds (GBIC’s) offer possibilities for the formation of superlattices such as two different magnetic intercalate layers separated by a single graphite layer. The GBIC has a stacking sequence of GI1GI2GI1GI2 along the c-axis, where two different intercalate layers (I1 and I2) alternate with a single graphite layer (G). Both magnetic RMGIC’s and GBIC’s provide model systems for studying magnetic phase transitions arising from various kinds of spin frustration effects: (i) spin glass and reentrant ferromagnet (stage-2 CucCo1-cCl2 GIC's and CocCo1-cCl2-FeCl3 GBIC’s), (ii) random field effect, (iii) 2D percolation behavior, (iv) 2D Ising antiferromagnet on the triangular lattice (CuCl2 GIC, MnCl2 GIC), and so on.
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