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

E. Janod; L. Leonyuk; V. Maltsev

doi:10.1016/S0038-1098(00)00365-3

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

Strongly Correlated Electrons 2009-10-31 v1

Authors: E. Janod , L. Leonyuk , V. Maltsev

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Abstract

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.

Keywords

quantum spin gap Cu$_2$(OH)$_2$CO$_3$ magnetic susceptibility alternating chain dimerized lattice

Cite

@article{arxiv.cond-mat/0009040,
  title  = {Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu$_2$(OH)$_2$CO$_3$},
  author = {E. Janod and L. Leonyuk and V. Maltsev},
  journal= {arXiv preprint arXiv:cond-mat/0009040},
  year   = {2009}
}

Comments

4 pages, 3 figures, 1 table

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