Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu2(OH)2CO3
E. Janod, L. Leonyuk, V. Maltsev
Abstract
Magnetic properties of the natural mineral Cu2(OH)2CO3 (malachite) were investigated through DC and AC susceptibility measurements. The analysis of the low-temperature part reveals a quantum spin-gap behavior with Δ≈ 130 K. Consistently with the crystal structure, the magnetic susceptibility can be accurately described by a model of alternating chain. The non-frustrating residual inter-chain magnetic couplings, describing a sort of dimerized square planar lattice, are not strong enough to push the system towards a long-range ordered ground state, in good agreement with recent theoretical studies.
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