Volume 89, Number 2, January 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 February 2010|
Charge ordering in substituted and non-stoichiometric BaVS3
Laboratoire de Physique des Solides, Université Paris-Sud, CNRS-UMR 8502 - 91405 Orsay Cedex, France, EU
2 Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP 48, 91192 Gif-sur-Yvette cedex, France, EU
3 IMEM-CNR, Area delle Scienze - 43100 Parma, Italy, EU
4 Université Pierre et Marie Curie-IMPMC, CNRS-UMR 7590 - 140 rue de Lourmel, 75015 Paris, France, EU
5 Institute of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne - CH-1015 Lausanne, Switzerland
Accepted: 21 December 2009
Among the correlated electronic systems, BaVS3 which exhibits both itinerant and localized states as well as a subtle interplay betwen charge, orbital, spin and lattice degrees of freedom, is a model system. Its electronic structure consists in a broad quasi–one-dimensional (1D) dz2 band and two quasi-degenerate narrow e(t2g) bands. Pure BaVS3 exhibits a metal-insulator transition (MIT) driven by a Peierls instability in the dz2 band. We present a structural investigation showing that in chemically substituted Ba1-xSrxVS3 and in non-stoichiometric BaVS3-δ, the commensurate Peierls distortion of BaVS3 is replaced by an incommensurate modulation that we attribute to a charge ordering (CO) of the localized e(t2g) electrons. This unexpected structural feature is discussed in relationship with the concomitant drastic change of magnetic properties of the system.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 61.05.C – X-ray diffraction and scattering / 71.45.Lr – Charge-density-wave systems
© EPLA, 2010
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