A. I. Smirnov, K. Yu. Povarov, S. V. Petrov, A. Ya. Shapiro
The temperature evolution of the electron spin resonance is studied at
cooling the crystal samples of Cs2CuCl4 through the Neel point 0.62 K. A
coexistence of the high-frequency spinon type resonance developed in the
spin-liquid phase and of the low-frequency antiferromagnetic resonance was
found in the ordered phase. The low-frequency magnetic resonance spectrum in
the low field range has two gapped branches and corresponds well to the
spectrum of spin excitations of a planar spiral spin structure with two axes of
the anisotropy. The field induced phase transitions result in a more
complicated low-frequency spectra.
View original:
http://arxiv.org/abs/1202.0783
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