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The anhydrous alums as model triangular-lattice magnets

Bramwell, ST; Carling, SG; Harding, CJ; Harris, KDM; Kariuki, BM; Nixon, L; Parkin, IP; (1996) The anhydrous alums as model triangular-lattice magnets. J PHYS-CONDENS MAT , 8 (9) L123 - L129.

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Abstract

We show that materials based on the yavapaiite layered structure are of potential interest as realizations of a model quasi-two-dimensional triangular-lattice antiferromagnet. The structure type is such that magnetic ions Occupy a regular or very slightly distorted triangular lattice in well separated layers. We report the magnetic susceptibility versus temperature behaviour of three compounds: RbFe(SO4)(2), which has an equilateral triangular lattice, and KFe(SO4)(2) and KTi(SO4)(2) which both have isosceles triangular lattices. A comparison of the behaviour of these three compounds identifies the effect of distortion and the spin value on the properties of the triangular-lattice antiferromagnet. KTi(SO4)(2), which we have made for the first time, has S = 1/2, and may prove to be the best example of the S = 1/2 triangular-lattice antiferromagnet yet discovered.

Type:Article
Title:The anhydrous alums as model triangular-lattice magnets
Keywords:HEISENBERG ANTIFERROMAGNETS, PHASE-TRANSITION, XY MODEL, FIELD, FERROMAGNETS, BEHAVIOR, LINIO2, STATE
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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