S. E. Nagler

Unconventional spin dynamics in the honeycomb-lattice material α-RuCl3 : High-field electron spin resonance studies

The honeycomb-lattice material

Longitudinal magnetic dynamics and dimensional crossover in the quasi-one-dimensional spin-1/2 heisenberg antiferromagnet KCuF3

\ensuremath{\alpha}

Comprehensive study of the dynamics of a classical Kitaev Spin Liquid

-RuCl

Zone-boundary excitations in coupled Haldane spin chain compounds PbNi{sub 2}V{sub 2}O{sub 8} and SrNi{sub 2}V{sub 2}O{sub 8}

{}_{3}

Spin dynamics of a Heisenberg S = 12 antiferromagnetic chain

is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.

Long-range antiferromagnetic order in theS=1chain compoundLiVGe2O6

The spin dynamics of coupled spin-1/2, antiferromagnetic Heisenberg chains is predicted to exhibit a novel longitudinal mode at low energies and temperatures below the Neel temperature. This mode is a dimensional crossover effect and reveals the presence of a limited amount of long-range antiferromagnetic order co-existing with quantum fluctuations. In this paper the existence of such a mode is confirmed in the model material KCuF3 using polarized and unpolarized inelastic neutron scattering and the longitudinal polarization of the mode is definitively established. The lineshape is broadened suggesting a reduced lifetime due to decay into spin-waves. In addition the data shows evidence of continuum scattering with a lower edge greater than the longitudinal mode energy. A detailed comparison is made with theoretical predictions and experimental work on other model materials.

Long-range antiferromagnetic order in the S=1 chain compound LiVGe{sub 2}O{sub 6}

We study the spin-

Square-lattice spiral magnetBa2CuGe2O7in an in-plane magnetic field

S

The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field

Kitaev model in the classical (

Square-lattice spiral magnet Ba{sub 2}CuGe{sub 2}O{sub 7} in an in-plane magnetic field

S\ensuremath{\rightarrow}\ensuremath{\infty}