Hironori Yamaguchi

New high magnetic field phase of the frustrated S = 1/2 chain compound LiCuVO4

Magnetization of the frustrated S = 1/2 chain compound LiCuVO4, 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, Europhys. Lett. 92, 37001 (2010)).

High-field electron spin resonance in the two-dimensional triangular-lattice antiferromagnet NiGa 2 S 4

We report experimental results of high-field electron spin resonance (ESR) measurements in magnetic fields up to about 53 T on the quasi-two-dimensional triangular-lattice antiferromagnet

Various regimes of quantum behavior in anS=12Heisenberg antiferromagnetic chain with fourfold periodicity

{\text{NiGa}}_{2}{\text{S}}_{4}

Novel Phase Transition Probed by Sound Velocity in Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8

. From the temperature evolution of the ESR absorption linewidth, we find three distinct temperature regions: those (i) above 23 K, (ii) between 23 K and 8.5 K, and (iii) below 8.5 K. The linewidth is affected by the dynamics of

Fine-Tuning of Magnetic Interactions in Organic Spin Ladders

{Z}_{2}

Two-Dimensional Honeycomb Lattice Consisting of a New Organic Radical 2-Cl-6-F-V

vortices below 23 K and one of the conventional spiral resonance modes explains well the frequency dependence of the ESR resonance fields far below 8.5 K. Furthermore, we found an anomaly in the magnetization curve around one third of the saturation magnetization for

High-Field ESR and Magnetization of the Triangular Lattice Antiferromagnet NiGa2S4

H\ensuremath{\perp}c

Randomness-induced quantum spin liquid on honeycomb lattice

, corresponding to softening of another resonance mode. These results suggest the occurrence of a

Experimental Realization of a Quantum Pentagonal Lattice.

{Z}_{2}

Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

vortex-induced topological transition at 8.5 K.