Spin-1/2 Quantum Antiferromagnetic Chains with Tunable Superexchange Interactions Found in BaCu2(Si1-xGex)2O 7

Author： Yamada T.   Hiroi Z.   Takano M.  

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.156, Iss.1, 2001-01, pp. : 101-109

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Abstract

Synthesis, structure, and magnetic properties of a novel one-dimensional spin-1/2 quantum antiferromagnetic (AF) system BaCu2(Si1-xGex)2O 7 (0≤x≤1) are reported. Contained in this system are corrugated CuO chains made of corner-sharing CuO4 squares with the dominant exchange interaction changing almost linearly between 290 K (x=0) and 580 K (x=1). Anomalies in susceptibility and specific heat, indicative of the occurrence of a long-range AF ordering, are observed at 8.9 K (x=0) and 8.6 K (x=1). A rich magnetic phase diagram results from this strong composition dependence combined with the switching of the interchain interaction changing from ferromagnetic (x=0) to AF (x=1).

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