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arxiv: 1810.02675 · v2 · pith:EEUMQT5Hnew · submitted 2018-10-05 · ❄️ cond-mat.str-el

Spin gap in a quasi-1D S=1/2 antiferromagnet K2CuSO4Cl2

classification ❄️ cond-mat.str-el
keywords antiferromagnetmagneticquasi-1dresonancespinabsenceanisotropiccrossover
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Electron spin resonance experiments in the quasi-1D S=1/2 antiferromagnet K$_2$CuSO$_4$Cl$_2$ reveal opening of a gap in absence of magnetic ordering, as well as an anisotropic shift of the resonance magnetic field. These features of magnetic excitation spectrum are explained by a crossover between a gapped spinon-type doublet ESR formed in a 1D antiferromagnet with uniform Dzyaloshinskii-Moriya interaction and a Larmor-type resonance of a quasi-1D Heisenberg system

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