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Title: Coexistence of Charge Order and Superconductivity in {ital {beta}'}'-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.

Abstract

In the all-organic paramagnetic correlated metal beta ''-(BEDT-TTF)(2)SF(5)CH(2)CF(2)SO(3 )spin fluctuations can be ruled out as the glue to superconductivity below T-c = 5.5 K. Instead, we demonstrate the coupling of charge degrees of freedom to the superconducting state, which occurs adjacent to a charge-ordered insulating phase. A comparison to isostructural beta ''-(BEDT-TTF)(2)SF(5)RSO3 compounds reveals that superconductivity is suppressed when the system is tuned away from the insulator towards the metal; an enhanced charge imbalance, on the other hand, leads to an increase in T-c, suggesting an involvement of charge fluctuations. By locally probing the charge disproportionation through the superconducting transition, we discover slight modifications of the Fano coupling constant and intensity at T-c, indicating the effect of the paired electrons on the molecular vibrations.

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:
1548284
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 99; Journal Issue: 14
Country of Publication:
United States
Language:
English

Citation Formats

Pustogow, A., Saito, Y., Rohwer, A., Schlueter, J. A., Dressel, Martin, and Curtiss, L. A. Coexistence of Charge Order and Superconductivity in {ital {beta}'}'-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.140509.
Pustogow, A., Saito, Y., Rohwer, A., Schlueter, J. A., Dressel, Martin, & Curtiss, L. A. Coexistence of Charge Order and Superconductivity in {ital {beta}'}'-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.. United States. doi:10.1103/PhysRevB.99.140509.
Pustogow, A., Saito, Y., Rohwer, A., Schlueter, J. A., Dressel, Martin, and Curtiss, L. A. Tue . "Coexistence of Charge Order and Superconductivity in {ital {beta}'}'-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.". United States. doi:10.1103/PhysRevB.99.140509.
@article{osti_1548284,
title = {Coexistence of Charge Order and Superconductivity in {ital {beta}'}'-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.},
author = {Pustogow, A. and Saito, Y. and Rohwer, A. and Schlueter, J. A. and Dressel, Martin and Curtiss, L. A.},
abstractNote = {In the all-organic paramagnetic correlated metal beta ''-(BEDT-TTF)(2)SF(5)CH(2)CF(2)SO(3 )spin fluctuations can be ruled out as the glue to superconductivity below T-c = 5.5 K. Instead, we demonstrate the coupling of charge degrees of freedom to the superconducting state, which occurs adjacent to a charge-ordered insulating phase. A comparison to isostructural beta ''-(BEDT-TTF)(2)SF(5)RSO3 compounds reveals that superconductivity is suppressed when the system is tuned away from the insulator towards the metal; an enhanced charge imbalance, on the other hand, leads to an increase in T-c, suggesting an involvement of charge fluctuations. By locally probing the charge disproportionation through the superconducting transition, we discover slight modifications of the Fano coupling constant and intensity at T-c, indicating the effect of the paired electrons on the molecular vibrations.},
doi = {10.1103/PhysRevB.99.140509},
journal = {Physical Review, B: Condensed Matter},
number = 14,
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