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Title: Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor

Abstract

By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor kappa-(BEDT-TTF)(2)Hg(SCN)(2)Cl, we provide evidence for order-disorder type electronic ferroelectricity that is driven by the charge order within the (BEDT-TTF)(2) dimers and stabilized by a coupling to the anions. According to our density functional theory calculations, this material is characterized by a moderate strength of dimerization. This system thus bridges the gap between strongly dimerized materials, often approximated as (imer-Mott systems at 1/2 filling, and nondimerized or weakly dimerized systems at 1/4 filling, exhibiting a charge order. Our results indicate that intradimer charge degrees of freedom are of particular importance in correlated kappa-(BEDT-TTF)(2)X salts and can create novel states, such as electronically driven multiferroicity or charge-order-induced quasi-one-dimensional spin liquids.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
German Research Foundation (DFG); National Science Foundation (NSF)
OSTI Identifier:
1483663
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Gati, Elena, Fischer, Jonas K. H., Lunkenheimer, Peter, Zielke, David, Köhler, Sebastian, Kolb, Felizitas, von Nidda, Hans-Albrecht Krug, Winter, Stephen M., Schubert, Harald, Schlueter, John A., Jeschke, Harald O., Valentí, Roser, and Lang, Michael. Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.247601.
Gati, Elena, Fischer, Jonas K. H., Lunkenheimer, Peter, Zielke, David, Köhler, Sebastian, Kolb, Felizitas, von Nidda, Hans-Albrecht Krug, Winter, Stephen M., Schubert, Harald, Schlueter, John A., Jeschke, Harald O., Valentí, Roser, & Lang, Michael. Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor. United States. doi:10.1103/PhysRevLett.120.247601.
Gati, Elena, Fischer, Jonas K. H., Lunkenheimer, Peter, Zielke, David, Köhler, Sebastian, Kolb, Felizitas, von Nidda, Hans-Albrecht Krug, Winter, Stephen M., Schubert, Harald, Schlueter, John A., Jeschke, Harald O., Valentí, Roser, and Lang, Michael. Fri . "Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor". United States. doi:10.1103/PhysRevLett.120.247601.
@article{osti_1483663,
title = {Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor},
author = {Gati, Elena and Fischer, Jonas K. H. and Lunkenheimer, Peter and Zielke, David and Köhler, Sebastian and Kolb, Felizitas and von Nidda, Hans-Albrecht Krug and Winter, Stephen M. and Schubert, Harald and Schlueter, John A. and Jeschke, Harald O. and Valentí, Roser and Lang, Michael},
abstractNote = {By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor kappa-(BEDT-TTF)(2)Hg(SCN)(2)Cl, we provide evidence for order-disorder type electronic ferroelectricity that is driven by the charge order within the (BEDT-TTF)(2) dimers and stabilized by a coupling to the anions. According to our density functional theory calculations, this material is characterized by a moderate strength of dimerization. This system thus bridges the gap between strongly dimerized materials, often approximated as (imer-Mott systems at 1/2 filling, and nondimerized or weakly dimerized systems at 1/4 filling, exhibiting a charge order. Our results indicate that intradimer charge degrees of freedom are of particular importance in correlated kappa-(BEDT-TTF)(2)X salts and can create novel states, such as electronically driven multiferroicity or charge-order-induced quasi-one-dimensional spin liquids.},
doi = {10.1103/PhysRevLett.120.247601},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 24,
volume = 120,
place = {United States},
year = {2018},
month = {6}
}

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