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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.
Publication status:
Published

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Publisher copy:
10.1103/PhysRevB.79.100103

Authors


Journal:
Phys. Rev. B More from this journal
Volume:
79
Issue:
10
Pages:
100103
Publication date:
2008-03-09
DOI:
EISSN:
1550-235X
ISSN:
1098-0121
Language:
English
Keywords:
Pubs id:
pubs:10112
UUID:
uuid:215aa6ef-1004-440f-914d-5ede77b37a88
Local pid:
pubs:10112
Source identifiers:
10112
Deposit date:
2012-12-19

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