Issue |
EPL
Volume 89, Number 3, February 2010
|
|
---|---|---|
Article Number | 37010 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/89/37010 | |
Published online | 22 February 2010 |
New electronic orderings observed in cobaltates under the influence of misfit periodicities
1
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: brouet@lps.u-psud.fr
Received:
28
October
2009
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.