New high magnetic field phase of the frustrated $S=1/2$ chain compound LiCuVO${}_4$

Abstract

Magnetization of the frustrated $S=1/2$ chain compound LiCuVO${}_4$, focusing on high magnetic field phases, is reported. Besides a spin-flop transition and the transition from a planar spiral to a spin modulated structure observed recently, an additional transition was observed just below the saturation field. This newly observed magnetic phase is considered as a spin nematic phase, which was predicted theoretically but was not observed experimentally. The critical fields of this phase and its dM/dH curve are in good agreement with calculations performed in a microscopic model (M. E. Zhitomirsky and H. Tsunetsugu, preprint, arXiv:1003.4096v2).

5 pages, 4 figures

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