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Hikomitsu Kikuchi,Nguyen Thi Tinh Y,Yutaka Fujii,Akira Matsuo,Koichi Kindo 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Orthorombic Cu5(PO4)3(OH)4 (pseudomalachite) is a layered compound. Each Cu-O layer in thiscompound is separated by PO4 tetrahedra. The spin network in the bc-plane of a pseudomlachite iscomposed of triangles and pentagons, which will induce the spin frustration effect. This network maybe a new type of geometrically frustrated spin lattice. Magnetic susceptibility, specific heat, highfield magnetization measurements are used to study the magnetic properties of Cu5(PO4)3(OH)4 innatural mineral samples. Magnetic ordering is observed at around 4.2 K. The spin entropy changeat the transition temperature is about one-fifth times smaller than that expected for a usual longrangeorder. A 1/5 magnetization plateau is observed in the high-field magnetization curve. Theplateau is explained based on a simple model in which the spin network is assumed to be composedof chain, dimer and monomer units.