skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Charge Order in {ital {beta}''}-Phase BEDT-TTF Salts.

Abstract

Experimentally, we establish the quantitative phase diagram of 1/4-filled beta ''-(BEDT-TTF)(2)SF5RSO3 with a tendency toward charge order. Comprehensive optical, transport, and susceptibility measurements reveal the insulating nature and magnetic properties of the charge-ordered ground state. Going from R = CHF via CH(2)CF(2 )and CHFCF2 toward CH2, a finite charge disproportionation appears and grows up to 28 = 0.5e, as evidenced by charge-sensitive molecular vibrations. This is accompanied by an increase of electronic correlation strength, i.e., the intersite Coulomb repulsion V becomes more pronounced in relation to the bandwidth W. The broadband electronic excitations and their anisotropy unveil a distinct charge pattern for R = CH2 (checkerboard type) as compared to the other compounds (stripelike). Our results validate theoretical predictions for 1/4-filled systems, substantiating the importance of charge fluctuations for unconventional superconductivity at the verge between metal and insulator.

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:
1548286
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 99; Journal Issue: 15
Country of Publication:
United States
Language:
English

Citation Formats

Pustogow, A., Treptow, K., Rohwer, A., Saito, Y., Alonso, M. Sanz, Lohle, A., Schlueter, J. A., and Dressel, M. Charge Order in {ital {beta}''}-Phase BEDT-TTF Salts.. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.155144.
Pustogow, A., Treptow, K., Rohwer, A., Saito, Y., Alonso, M. Sanz, Lohle, A., Schlueter, J. A., & Dressel, M. Charge Order in {ital {beta}''}-Phase BEDT-TTF Salts.. United States. doi:10.1103/PhysRevB.99.155144.
Pustogow, A., Treptow, K., Rohwer, A., Saito, Y., Alonso, M. Sanz, Lohle, A., Schlueter, J. A., and Dressel, M. Tue . "Charge Order in {ital {beta}''}-Phase BEDT-TTF Salts.". United States. doi:10.1103/PhysRevB.99.155144.
@article{osti_1548286,
title = {Charge Order in {ital {beta}''}-Phase BEDT-TTF Salts.},
author = {Pustogow, A. and Treptow, K. and Rohwer, A. and Saito, Y. and Alonso, M. Sanz and Lohle, A. and Schlueter, J. A. and Dressel, M.},
abstractNote = {Experimentally, we establish the quantitative phase diagram of 1/4-filled beta ''-(BEDT-TTF)(2)SF5RSO3 with a tendency toward charge order. Comprehensive optical, transport, and susceptibility measurements reveal the insulating nature and magnetic properties of the charge-ordered ground state. Going from R = CHF via CH(2)CF(2 )and CHFCF2 toward CH2, a finite charge disproportionation appears and grows up to 28 = 0.5e, as evidenced by charge-sensitive molecular vibrations. This is accompanied by an increase of electronic correlation strength, i.e., the intersite Coulomb repulsion V becomes more pronounced in relation to the bandwidth W. The broadband electronic excitations and their anisotropy unveil a distinct charge pattern for R = CH2 (checkerboard type) as compared to the other compounds (stripelike). Our results validate theoretical predictions for 1/4-filled systems, substantiating the importance of charge fluctuations for unconventional superconductivity at the verge between metal and insulator.},
doi = {10.1103/PhysRevB.99.155144},
journal = {Physical Review, B: Condensed Matter},
number = 15,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

Works referenced in this record:

Metal-insulator transitions
journal, October 1998

  • Imada, Masatoshi; Fujimori, Atsushi; Tokura, Yoshinori
  • Reviews of Modern Physics, Vol. 70, Issue 4, p. 1039-1263
  • DOI: 10.1103/RevModPhys.70.1039