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Regular version of the site

Article

Spin gap in the quasi-one-dimensional S=1/2 antiferromagnet K2CuSO4Cl2

A. I. Smirnov, Soldatov T. A., Povarov K. Y., Halg M., Lorenz W. E., Zheludev A.

Electron spin resonance (ESR) experiments in the quasi-one-dimensional (quasi-1D) S=12 antiferromagnet K2CuSO4Cl2 reveal the opening of a gap in the absence of magnetic ordering, as well as an anisotropic shift of the resonance magnetic field. These features of the 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.