Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu$_2$(OH)$_2$CO$_3$

Details Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu$_2$(OH)$_2$CO$_3$ Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu$_2$(OH)$_2$CO$_3$

2000-09-04

arxiv.org/abs/cond-mat/0009040v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, 1 table

Scientific paper

10.1016/S0038-1098(00)00365-3

Magnetic properties of the natural mineral Cu$_2$(OH)$_2$CO$_3$ (malachite) were investigated through DC and AC susceptibility measurements. The analysis of the low-temperature part reveals a quantum spin-gap behavior with $\Delta \approx 130 K$. 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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