Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-12
Europhysics Letters 89, 37010 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
We study with ARPES the electronic structure of CoO2 slabs, stacked with rock-salt (RS) layers exhibiting a different (misfit) periodicity. Fermi Surfaces (FS) in phases with different doping and/or periodicities reveal the influence of the RS potential on the electronic structure. We show that these RS potentials are well ordered, even in incommensurate phases, where STM images reveal broad stripes with width as large as 80\AA. The anomalous evolution of the FS area at low dopings is consistent with the localization of a fraction of the electrons. We propose that this is a new form of electronic ordering, induced by the potential of the stacked layers (RS or Na in NaxCoO2) when the FS becomes smaller than the Brillouin Zone of the stacked structure.
Bertran F.
Brouet Veronique
Chambon C.
F`evre P. Le
Grebille Dominique
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