Publication

Charge ordering in substituted and non-stoichiometric BaVS3

László Forró, Helmuth Berger, Ana Akrap
2010
Journal Articles

Abstract

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) d(z2) band and two quasi-degenerate narrow e(t(2g)) bands. Pure BaVS3 exhibits a metal-insulator transition (MIT) driven by a Peierls instability in the d(z2) band. We present a structural investigation showing that in chemically substituted Ba1-xSrxVS3 and in non-stoichiometric BaVS3-delta, the commensurate Peierls distortion of BaVS3 is replaced by an incommensurate modulation that we attribute to a charge ordering (CO) of the localized e(t(2g)) electrons. This unexpected structural feature is discussed in relationship with the concomitant drastic change of magnetic properties of the system. Copyright (C) EPLA, 2010

Official source

https://infoscience.epfl.ch/entities/publication/a8763cd0-a3de-4920-8c75-07a9ae1d3b7b

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László Forró, Helmuth Berger, Ana Akrap
2010
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a8763cd0-a3de-4920-8c75-07a9ae1d3b7b

About this result

Related concepts (28)

Strongly correlated material

Strongly correlated materials are a wide class of compounds that include insulators and electronic materials, and show unusual (often technologically useful) electronic and magnetic properties, such as metal-insulator transitions, heavy fermion behavior, half-metallicity, and spin-charge separation. The essential feature that defines these materials is that the behavior of their electrons or spinons cannot be described effectively in terms of non-interacting entities.

Mott insulator

Mott insulators are a class of materials that are expected to conduct electricity according to conventional band theories, but turn out to be insulators (particularly at low temperatures). These insulators fail to be correctly described by band theories of solids due to their strong electron–electron interactions, which are not considered in conventional band theory. A Mott transition is a transition from a metal to an insulator, driven by the strong interactions between electrons.

Electronic band structure

In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energy levels that electrons may have within it, as well as the ranges of energy that they may not have (called band gaps or forbidden bands). Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules.

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