Rearrangement of Sodium ordering and its effect on physical properties in $Na_xCoO_2$ system

Details Rearrangement of Sodium ordering and its effect on physical properties in $Na_xCoO_2$ system Rearrangement of Sodium ordering and its effect on physical properties in $Na_xCoO_2$ system

2008-08-31

arxiv.org/abs/0809.0096v1

Phys. Rev. B 78, 115122(2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures

Scientific paper

10.1103/PhysRevB.78.115122

We systematically study Raman spectroscopy of cleaved Na$_x$CoO$_2$ single crystals with 0.37 $\leq$ x $\leq$ 0.80. The Raman shift of A$_{1g}$ mode is found to be linearly dependent on Na content, while the Raman shift of E$_{1g}$ mode has an abnormal shift to high frequency around x = 0.5. The abnormal shift is ascribed to the occurrence of Na rearrangement in O1 structure. Temperature dependent Raman spectrum for x = 0.56 sample shows that Na rearrangement transition from O1 structure to H1 structure occurs around 240 K. Electronic transport and susceptibility for the sample with $x=0.56$ show a response to the Na rearrangement transition from O1 to H1 structure, and that different Na ordering pattern causes distinct physical properties. These results give a direct evidence to proved Na ordering effect on physical properties of Co-O plane.

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