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We report the observation of a frequency shift and splitting of the electronspin resonance (ESR) mode of the low-dimensional S=1/2 frustratedantiferromagnet Cs2CuCl4 in the spin-correlated state below the Curie-Weisstemperature 4 K but above the ordering temperature 0.62 K. The shift andsplitting exhibit strong anisotropy with respect to the direction of theapplied magnetic field and do not vanish in zero field. The low-temperatureevolution of spin resonance response is a result of the specific modificationof one-dimensional spinon continuum under the action of the uniformDzyaloshinskii-Moriya interaction (DM) within the spin chains. Parameters ofthe uniform DM interaction are derived from the experiment.

Modes of magnetic resonance in the spin liquid phase of Cs2CuCl4