Helicoidal magnetic order in a clean copper oxide spin chain compound

Details Helicoidal magnetic order in a clean copper oxide spin chain compound Helicoidal magnetic order in a clean copper oxide spin chain compound

2004-11-30

arxiv.org/abs/cond-mat/0411753v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures Improved Fig.1 and 4. Minor rephrasing. Reference added

Scientific paper

We report susceptibility, specific heat, and neutron diffraction measurements on NaCu$_2$O$_2$, a spin-1/2 chain compound isostructural to LiCu$_2$O$_2$, which has been extensively investigated. Below 13 K, we find a long-range ordered, incommensurate magnetic helix state with a propagation vector similar to that of LiCu$_2$O$_2$. In contrast to the Li analogue, substitutional disorder is negligible in NaCu$_2$O$_2$. We can thus rule out that the helix is induced by impurities, as was claimed on the basis of prior work on LiCu$_2$O$_2$. A spin Hamiltonian with frustrated longer-range exchange interactions provides a good description of both the ordered state and the paramagnetic susceptibility.

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