Optical properties of {beta}{double{underscore}prime}-(ET){sub 2}SF{sub 5}RSO{sub 3} (R = CH{sub 2}CF{sub 2}, CHFCF{sub 2}): Changing physical properties by chemical tuning of the counterion
- and others
The authors report the polarized infrared reflectance of {Beta}{double{underscore}prime}-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3} as a function of temperature. This salt is a derivative of the first fully organic superconductor, {beta}{double{underscore}prime}-(ET){sub 2}SR{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}, where the nature of the alkyl group has been modified to contain a chiral center. This small chemical modification has a dramatic effect on the spectral and charge transport properties. The {beta}{double{underscore}prime}-(ET){sub 2}SF{sub 5}CHFCF{sub 2}SO{sub 3} complex displays highly anisotropic behavior compared with the superconducting material; the essential difference is observed in the {perpendicular}b direction where the interdimer interaction is weak, in agreement with recent theoretical calculations. The temperature dependence of key anion vibrational modes is discussed in terms of intermolecular hydrogen bonding within the anion pocket. That small chemical modifications of the anion template result in such striking changes in the physical properties suggests that the {beta}{double{underscore}prime}-(ET){sub 2}SF{sub 5}RSO{sub 3} system is quite close to a Mott phase boundary.
- Research Organization:
- State Univ. of New York, Binghamton, NY (US)
- Sponsoring Organization:
- National Science Foundation; US Department of Energy; American Chemical Society
- OSTI ID:
- 20004027
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 11 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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Mon Jul 24 00:00:00 EDT 2000
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OSTI ID:759057