P. G. Freeman

Magnetic order and dynamics of the charge-ordered antiferromagnet La 1.5 Sr 0.5 CoO 4

We describe neutron-scattering experiments performed to investigate the magnetic order and dynamics of half-doped

Anisotropic neutron spin resonance in superconducting BaFe(1.9)Ni(0.1)As(2)

{\text{La}}_{1.5}{\text{Sr}}_{0.5}{\text{CoO}}_{4}

CAMEA ESS: The Continuous Angle Multi-Energy Analysis Indirect Geometry Spectrometer for the European Spallation Source

. This layered perovskite exhibits a near-ideal checkerboard pattern of

Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9

{\text{Co}}^{2+}/{\text{Co}}^{3+}

Magnetization of La2- xSrxNiO4+δ (0≤x≤0.5) : Spin-glass and memory effects

charge order at temperatures below

Spin correlations among the charge carriers in an ordered stripe phase.

\ensuremath{\sim}800\text{ }\text{K}

Prismatic analyser concept for neutron spectrometers

. Magnetic correlations are observed at temperatures below

Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO4

\ensuremath{\sim}60\text{ }\text{K}

Direct evidence for charge stripes in a layered cobalt oxide.

but the magnetic order only becomes established at 31 K, a temperature at which a kink is observed in the susceptibility. On warming above 31 K we observed a change in the magnetic correlations which we attribute either to a spin canting or to a change in the proportion of inequivalent magnetic domains. The magnetic excitation spectrum is dominated by an intense band extending above a gap of approximately 3 meV up to a maximum energy of 16 meV. A weaker band exists in the energy range of 20\char21{}30 meV. We show that the excitation spectrum is in excellent quantitative agreement with the predictions of a spin-wave theory generalized to include the full magnetic degrees of freedom of high-spin

Sc2Ga2CuO7: A possible quantum spin liquid near the percolation threshold

{\text{Co}}^{2+}