Modes of Magnetic Resonance in the Spin-Liquid Phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Cs</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuCl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>
K. Yu. PovarovP. L. Kapitza Institute for Physical Problems, RAS, 119334 Moscow, RussiaA. I. SmirnovMoscow Institute for Physics and Technology, 141700, Dolgoprudny, RussiaOleg A. StarykhDepartment of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USAS. V. PetrovP. L. Kapitza Institute for Physical Problems, RAS, 119334 Moscow, RussiaA. Ya. ShapiroA. V. Shubnikov Institute of Crystallography, RAS, 119333 Moscow, Russia
2011lv
ABI
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 ${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$ 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.
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Cited by 20 references