Helimagnetism in a disordered and geometrically frustrated quantum spin chain

Details Helimagnetism in a disordered and geometrically frustrated quantum spin chain Helimagnetism in a disordered and geometrically frustrated quantum spin chain

2003-10-06

arxiv.org/abs/cond-mat/0310126v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 4 figures

Scientific paper

Neutron diffraction and bulk measurements are used to determine the nature of the low-temperature ordered state in LiCu$_2$O$_2$, a $S=1/2$ spin-chain compound with competing interactions. The magnetic structure is found to be helimagnetic, with a propagation vector $(0.5,\zeta,0)$, $\zeta=0.174$. The nearest-neighbor exchange constant and frustration ratio are estimated to be $J=5.8$ meV and $J_2/J_1=0.29$, respectively. For idealized spin chains these parameter values would signify a gapped spin-liquid ground state. Long-range ordering is attributed to intrinsic non-stoichiometry.

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