Volume 89, Number 3, February 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 February 2010|
New electronic orderings observed in cobaltates under the influence of misfit periodicities
Laboratoire Physique des Solides, Université Paris-Sud, UMR8502 - Bât 510, 91405 Orsay, France, EU
2 Synchrotron SOLEIL, L'Orme des Merisiers - Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France, EU
3 CNR-INFM, Laboratorio Nazionale TASC c/o Area Science Park - s.s. 14 Km. 163.5, I-34012 Basovizza (TS), Italy, EU
4 Institut Jean Lamour, CNRS-Nancy-Université-UPV-Metz - 54506 Vandoeuvre-les-Nancy, France, EU
5 Laboratoire CRISMAT, UMR 6508 CNRS et Ensicaen - 14050 Caen, France, EU
Corresponding author: email@example.com
Accepted: 19 January 2010
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 Å. 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.
PACS: 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor / 71.30.+h – Metal-insulator transitions and other electronic transitions / 79.60.-i – Photoemission and photoelectron spectra
© EPLA, 2010
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