Crystal-to-stripe reordering of sodium ions in NaxCoO2 (x>=0.75)

Abstract

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-of-hexagons diffraction pattern observed for x=0.78 can be reproduced using coexisting square and striped phases that are related by simple shear deformations. All compositions exhibit a partial melting transition to a disordered stripe phase just below room temperature, which alters the topology of the electrical conduction pathways.

Published in Phys. Rev. B

References in corpus (5)

• Sodium vacancy ordering and the co-existence of localized spins and itinerant charges in NaxCoO2
• Electronic texture of the thermoelectric oxide Na0.75CoO2
• Direct link between low temperature magnetism and high temperature sodium order in NaxCoO2
• Melting of the Na layers in solid Na0.8CoO2
• Sodium Trimer Ordering on NaxCoO2 Surface

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• Transition from a phase-segregated state to single-phase incommensurate sodium ordering in Na_xCoO_2 with x \approx 0.53
• Divacancy superstructures in thermoelectric calcium-doped sodium cobaltate