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Charge density waves in the mixed valence two dimensional metal, K(3)Cu(8)S(6).

01 January 1987

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In order to study the physical properties of K(3)Cu(8)S(6), we have carefully defined the synthetic conditions for KCu (4)S(3), K(3)Cu(8)S(6) and KCu(3)S(2). K(3)Cu(8)S(6) is apparently a kinetic phase and must be trapped with a minimum amount of either KCu(4)S(3) or KCu(3)S(2). Magnetic susceptibility and electrical resistivity data display behavior typical of CDW systems. In view of the low-dimensional metallic nature of K(3) Cu(8)S(6) and preliminary X-ray data, a second order reversible transition at T(1)=153K has been identified as the onset of an incommensurate lattice. In the region of 50-60k, at first order transition with considerable hysteresis seems to be a structural transition to a commensurate superlattice state.