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Charge disproportionation and collinear magnetic order in the frustrated triangular antiferromagnet AgNiO2
E. Wawrzynska, R. Coldea, E. M. Wheeler +5
We report a high-resolution neutron diffraction study of the crystal and magnetic structure of the orbitally-degenerate frustrated metallic magnet AgNiO2. At high temperatures the…
Quantum dynamics and entanglement of spins on a square lattice
N. B. Christensen, H. M. Ronnow, D. F. McMorrow +6
Bulk magnetism in solids is fundamentally quantum mechanical in nature. Yet in many situations, including our everyday encounters with magnetic materials, quantum effects are maske…
Anomalous temperature evolution of the internal magnetic field distribution in the charge-ordered triangular antiferromagnet AgNiO2
T. Lancaster, S. J. Blundell, P. J. Baker +6
Zero-field muon-spin relaxation measurements of the frustrated triangular quantum magnet AgNiO2 are consistent with a model of charge disproportionation that has been advanced to e…
Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2
E. Wawrzynska, R. Coldea, E. M. Wheeler +6
We report a high-resolution neutron diffraction study on the orbitally-degenerate spin-1/2 hexagonal antiferromagnet AgNiO2. A structural transition to a tripled unit cell with exp…
Evidence for decay of spin-waves above the pseudogap in underdoped YBa2Cu3O6.35
C. Stock, R. A. Cowley, W. J. L. Buyers +7
The magnetic spectrum at high-energies in heavily underdoped YBaCuO (T=18 K) has been determined throughout the Brillouin zone. At low-energy the scatter…
Quantum phase transitions in magnetism and superconductivity: emergent spin topology seen with neutrons
W. J. L. Buyers, C. Stock, Z. Yamani +7
Magnetic spins and charges interact strongly in high-temperature superconductors. New physics emerges as layers of copper oxide are tuned towards the boundary of the superconductin…