Abstract
We present the results of the magnetization and dielectric constant measurements on untwinned single-crystal samples of the frustrated $S=1/2$ chain cuprate LiCu${}_{2}$O${}_{2}$. Magnetic phase transitions were observed. A spin-flop transition of the spiral spin plane was observed for the field orientations $\mathbit{H}\ensuremath{\parallel}\mathbit{a}$, $\mathbit{b}$. The second magnetic transition was observed at $H\ensuremath{\approx}15$ T for all three principal field directions. This high-field magnetic phase is discussed as a collinear spin-modulated phase, which is expected for an $S=1/2$ nearest-neighbor ferromagnetic and next-nearest-neighbor antiferromagnetic chain system.
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