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

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

2008-03-09

arxiv.org/abs/0803.1312v3

Phys. Rev. B 79, 100103(R) (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.100103

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.

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