Abstract
By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor κ-(BEDT-TTF)2Hg(SCN)2Cl, 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 dimer-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 κ-(BEDT-TTF)2X salts and can create novel states, such as electronically driven multiferroicity or charge-order-induced quasi-one-dimensional spin liquids.
| Original language | English |
|---|---|
| Article number | 247601 |
| Journal | Physical Review Letters |
| Volume | 120 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - Jun 14 2018 |
Fingerprint
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor. / 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 Olaf; Valentí, Roser; Lang, Michael.
In: Physical Review Letters, Vol. 120, No. 24, 247601, 14.06.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor
AU - Gati, Elena
AU - Fischer, Jonas K.H.
AU - Lunkenheimer, Peter
AU - Zielke, David
AU - Köhler, Sebastian
AU - Kolb, Felizitas
AU - Von Nidda, Hans Albrecht Krug
AU - Winter, Stephen M.
AU - Schubert, Harald
AU - Schlueter, John A.
AU - Jeschke, Harald Olaf
AU - Valentí, Roser
AU - Lang, Michael
PY - 2018/6/14
Y1 - 2018/6/14
N2 - By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor κ-(BEDT-TTF)2Hg(SCN)2Cl, 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 dimer-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 κ-(BEDT-TTF)2X salts and can create novel states, such as electronically driven multiferroicity or charge-order-induced quasi-one-dimensional spin liquids.
AB - By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor κ-(BEDT-TTF)2Hg(SCN)2Cl, 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 dimer-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 κ-(BEDT-TTF)2X salts and can create novel states, such as electronically driven multiferroicity or charge-order-induced quasi-one-dimensional spin liquids.
UR - http://www.scopus.com/inward/record.url?scp=85048630347&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85048630347&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.247601
DO - 10.1103/PhysRevLett.120.247601
M3 - Article
AN - SCOPUS:85048630347
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 24
M1 - 247601
ER -