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Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain c.pdf

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Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain c

a r X i v : c o n d - m a t / 0 3 1 0 0 3 4 v 2 [ c o n d - m a t .s t r - e l ] 5 J a n 2 0 0 4 Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compound Sr3CuPtO6 S. Majumdar, V. Hardy,? M. R. Lees, and D. McK. Paul Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom H. Rousselie?re and D. Grebille Laboratoire CRISMAT, UMR 6508, Boulevard du Mare?chal Juin, 14050 Caen cedex, France The Heisenberg spin chain compound Sr3CuPtO6 is investigated by magnetic susceptibility and heat capacity measurements. Sr3CuPtO6 has an unconventional chain structure in the sense that i) the spin half copper atoms are arranged in a zigzag chain structure, and ii) neighboring Cu atoms along the chains are separated by spin zero platinum atoms. We report that this compound shows broad features in the temperature dependence of both the magnetic contribution to the heat capacity and the magnetic susceptibility. Despite the unconventional nature of the spin chain structure, this set of data exhibits good agreement with theoretical models for a classical S = 1 2 Heisenberg spin chain compound. The values of the intra-chain coupling constant, obtained by different techniques, are found to be very close to each other. The low temperature heat capacity data (below ～ 6 K) exhibit a deviation from the theoretically expected behavior, which could be related to a small energy gap in the spin excitation spectrum. PACS numbers: 75.40.Cx, 75.50.Ee, 75.10.Pq I. INTRODUCTION A new class of one-dimensional (1D) magnetic com- pounds with the general formula A3XYO6 (A = Sr, Ca; X, Y = transition metals) has attracted particular inter- est recently.1 These materials crystallize in a K4CdCl6- type rhombohedral structure, which consists of infinite chains built up of alternating face-sharing YO6 octahe- dra and XO6 trigonal prisms. These YO6-XO6 chains are separated from each other by A2+ cations and constitute a hexagonal cross-sect