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Crystal-to-stripe reordering of sodium ions in NaxCoO2 (x>=0.75)
D. J. P. Morris, M. Roger, M. J. Gutmann +8
The sodium reordering in NaxCoO2 in the vicinity of room temperature is rationalized at high x in terms of phase transitions between square and striped phases. A striking hexagon-o…
On the Ordering of Na Ions in NaCoO
M. Roger, D. J. P. Morris, D. A. Tennant +8
The influence of electrostatic interactions on the ordering of sodium ions in NaCoO is studied theoretically through Monte-Carlo simulations. For large small di- or tri…
Patterning of sodium ions and the control of electrons in sodium cobaltate
M. Roger, D. J. P. Morris, D. A. Tennant +10
NaxCoO2 has emerged as a material of exceptional scientific interest due to the potential for thermoelectric applications, and because the strong interplay between the magnetic and…
Spin correlations in the paramagnetic phase and ring exchange in lanthanum cuprate
A. M. Toader, J. P. Goff, M. Roger +3
Spin correlations in the paramagnetic phase of lanthanum cuprate have been studied using polarized neutron scattering, with two important results. First, the temperature dependence…