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Superstructures in insulating and metallic lanthanum-doped sodium cobaltate
The thermoelectric properties of NaxCoO2 can be substantially improved by replacing Na ions by cations of higher valence. Our neutron diffraction studies on SXD for doping with... -
Exploring the metal-insulator transition in Ca2RuO4
Ca2RuO4 is a fascinating compound, where strong electronic correlations give rise to many unique features. Just above room temperature (~360 K) the system is metallic, below the... -
Rattling modes in new thermoelectrics
NaxCoO2 has an exceptional combination of thermoelectric properties, including low thermal conductivity, and it is currently under consideration for use in power recovery and as... -
Solving the magnetic structure of ruthenium based 2H-perovskites
The variant of the Hexagonal perovskite oxides are characterised by chains of trigonal prisms and octahedra, leading to a number of fascinating properties. Using resonant x-ray... -
Magnetic and charge ordering, superstructures and diffuse scattering in de-in...
Sodium Cobaltate has a complex phase diagram, exhibiting various phenomena and a kaleidoscope of superlattice diffraction patterns as the concentration of sodium is varied. It... -
Magnetic and charge ordering, superstructures and diffuse scattering in de-in...
Sodium Cobaltate has a complex phase diagram, exhibiting various phenomena and a kaleidoscope of superlattice diffraction patterns as the concentration of sodium is varied. It... -
Oxygen-deficient quantum spin ice
In quantum analogues of the spin ice materials quantum mechanical tunneling between ground states is expected, and exotic emergent behaviour has been predicted including a Higgs... -
Ionic and electronic conductors the magnetic structure behind cathode materia...
Ni rich layered oxides are promising cathode materials for Li-ion batteries since they fulfil the energy density requirements of the automobile industry but they tend to degrade... -
Superstructures in iron-based superconductor Cs0.8Fe1.6Se2
Cs0.8Fe1.6Se2 becomes superconducting below 27K despite the presence of antiferromagnetism with a large moment of about 3.3 Bohr magnetons and an unusually high ordering... -
Influence of superstructures on rich transport properties of lithium cobaltate
In the vicinity of x ~ 0.75, LixCoO2 has potential as a thermoelectric, since it has a high Seebeck coefficient and metallic conductivity. We have performed the first successful... -
Defect structure of the stuffed pyrochlore Yb2+xTi2-xO7-x/2
The magnetic ground states of geometrically frustrated pyrochlores are highly sensitive to the presence of defects. The stuffing of rare-earth ions on titanium sites has... -
Defect structure of the stuffed pyrochlore Yb2+xTi2-xO7-x/2
The magnetic ground states of geometrically frustrated pyrochlores are highly sensitive to the presence of defects. The stuffing of rare-earth ions on titanium sites has... -
Structural distortions and magnetic ordering in oxygen depleted spin ice
Geometrical frustration in the spin ice material Dy2Ti2O7 leads to macroscopic degeneracy and the observation of magnetic diffuse neutron scattering down to the lowest... -
Defects and monopole dynamics in spin ice
We have determined the defect structure of oxygen-depleted Y2Ti2O7 using diffuse neutron scattering, and we find that these oxygen vacancies are also the dominant defects in... -
Diffusion pathways of sodium ions in Sodium Cobaltate via Fourier density maps
Sodium Cobaltate is in the same family of compounds as the battery material Lithium Cobaltate, and the fact that sodium is more abundant than lithium makes it an attractive...
