title: Modes of magnetic resonance in the spin-liquid phase of Cs2CuCl4.
abstract: We report the observation of a frequency shift and splitting of the electron spin resonance (ESR) mode of the low-dimensional S=1/2 frustrated antiferromagnet Cs2CuCl4 in the spin-correlated state above the ordering temperature 0.62 K. The shift and splitting exhibit strong anisotropy with respect to the direction of the applied magnetic field and do not vanish in a zero field. The low-temperature evolution of the ESR is a result of the modification of the one-dimensional spinon continuum by the uniform Dzyaloshinskii-Moriya interaction within the spin chains.
authors.affiliation: P. L. Kapitza Institute for Physical Problems, RAS, 119334 Moscow, Russia. povarov@kapitza.ras.ru
authors.forename: K Yu
authors.initials: KY
authors.lastname: Povarov
authors.forename: A I
authors.initials: AI
authors.lastname: Smirnov
authors.forename: O A
authors.initials: OA
authors.lastname: Starykh
authors.forename: S V
authors.initials: SV
authors.lastname: Petrov
authors.forename: A Ya
authors.initials: AY
authors.lastname: Shapiro