Publication

Interplay of electronic correlations and lattice instabilities in BaVS3

Helmuth Berger
2009
Journal Articles

Abstract

The quasi-one-dimensional metallic system BaVS3 with a metal-insulator transition at T-MI=70 K shows large changes in the optical phonon spectrum, a central peak, and an electronic Raman scattering continuum that evolve in a three-step process. Motivated by the observation of a strongly fluctuating precursor state at high temperatures and orbital ordering and a charge gap at low temperatures, we suggest a concerted action of the orbital, electronic, and lattice subsystems in BaVS3 dominated by electronic correlations.

Official source

https://infoscience.epfl.ch/entities/publication/0c8e516f-98d5-4cfe-8232-b17ae6b92ed8

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Helmuth Berger
2009
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0c8e516f-98d5-4cfe-8232-b17ae6b92ed8

About this result

Related concepts (32)

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 correlation

Electronic correlation is the interaction between electrons in the electronic structure of a quantum system. The correlation energy is a measure of how much the movement of one electron is influenced by the presence of all other electrons. Within the Hartree–Fock method of quantum chemistry, the antisymmetric wave function is approximated by a single Slater determinant. Exact wave functions, however, cannot generally be expressed as single determinants.

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.

Related publications (31)

Interplay of electronic correlations and lattice instabilities in BaVS3

Chat with Graph Search

Realization of Organocerium-Based Fullerene Molecular Materials Showing Mott Insulator-Type Behavior

Scanning Tunneling Microscopy for Molecules: Effects of Electron Propagation into Vacuum

Shedding light on the MRI-driven dynamo in a stratified shearing box