Local and spatial disorder in {beta}{sup "}-(ET){sub 2}SF{sub 5}RSO{sub 3} solid solutions (R=CH{sub 2}CF{sub 2}, CHF, CHFCF{sub 2}).
We report the polarized infrared reflectance spectra and optical conductivity of {beta}{sup '}-(ET){sub 2}SF{sub 5}RSO{sub 3} superconducting (R = CH{sub 2}CF{sub 2}), metallic (R = CHF), and metal-insulator (R = CHFCF{sub 2}) mixed crystal materials. Incorporation of chiral counterions in the superconducting matrix allows us to tune the physical and spectroscopic properties over the composition range by modulating the anion potential. We conclude that the two low-energy electronic excitations at {approx}5200 and 9600 cm-1 are spectral manifestations of charge localization in the ET stack, made manifest by both local (anion pocket) and spatial (positional) disorder.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; OUS
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949392
- Report Number(s):
- ANL/MSD/JA-40558
- Journal Information:
- Chem. Mater., Journal Name: Chem. Mater. Journal Issue: 7 ; Jul. 2002 Vol. 14; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- ENGLISH
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