We review ground states and excitations of a quantum antiferromagnet on triangular and
other frustrated lattices. We pay special attention to the combined effects of magnetic field h …

The Horace suite of programs has been developed to work with large multiple-measurement
data sets collected from time-of-flight neutron spectrometers equipped with arrays of position …

The hexagonal RMnO3 (h-RMnO3) are multiferroic materials, which exhibit the coexistence
of a magnetic order and ferroelectricity. Their distinction is in their geometry that both results …

We elucidate the role of magnon interaction and spontaneous decays in the spin dynamics
of the triangular-lattice Heisenberg antiferromagnet by calculating its dynamical structure …

The spin-1/2 triangular lattice antiferromagnet YbMgGaO 4 has attracted attention recently
as a quantum spin-liquid candidate with the possible presence of off-diagonal anisotropic …

The breakdown of magnons, the quasiparticles of magnetic systems, has rarely been seen.
By using an inelastic neutron scattering technique, we report the observation of …

Magnons and phonons are fundamental quasiparticles in a solid and can be coupled
together to form a hybrid quasi-particle. However, detailed experimental studies on the …

Inelastic X-ray scattering with meV energy resolution (IXS) is an ideal tool to measure
collective excitations in solids and liquids. In non-resonant scattering condition, the cross …

CuO6 octahedra usually show elongated distortion, leading to active dx 2− y2 orbitals and
planar exchange interactions, while compressed CuO6 octahedra with active d 3 z 2− r 2 …

Low-energy spin excitations in any long-range ordered magnetic system in the absence of
magnetocrystalline anisotropy are gapless Goldstone modes emanating from the ordering …