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06 July 2020
 
  » arxiv » cond-mat/0310126

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Helimagnetism in a disordered and geometrically frustrated quantum spin chain
T. Masuda ; A. Zheludev ; A. Bush ; M. Markina ; A. Vasiliev ;
Date 6 Oct 2003
Subject Strongly Correlated Electrons | cond-mat.str-el
AbstractNeutron 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.
Source arXiv, cond-mat/0310126
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