1. Metal-insulator transitions and superconductivity in ditetramethyltetraselenafulvalenium fluorosulfonate [(TMTSF)2FSO3]
- Author
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R.C. Lacoe, E. Aharon-Shalom, Fred Wudl, S. A. Wolf, and Paul Chaikin
- Subjects
Superconductivity ,Materials science ,Condensed matter physics ,Band gap ,Fermi level ,Fermi surface ,symbols.namesake ,Electrical resistivity and conductivity ,Condensed Matter::Superconductivity ,Seebeck coefficient ,Phase (matter) ,symbols ,Condensed Matter::Strongly Correlated Electrons ,Phase diagram - Abstract
We have investigated the phase diagram of the orgainic charge-transfer salt ditetramethyltetraselenafulvalenium fluorosulfenate [${(\mathrm{TMTSF})}_{2}$FS${\mathrm{O}}_{3}$] which contains an asymmetric dipolar anion. At low pressures there is a metal-insulator transition related to anion ordering. Between 5 and 6 kbar, there is a dipolar glass phase with increased resistivity. However, thermopower and superconducting measurements indicate that the Fermi surface remains ungapped. Above 5 kbar there is a superconducting transition with ${T}_{c}g2$ K. This is the highest ${T}_{c}$ for this family of compounds and suggests that the anions can enhance ${T}_{c}$.
- Published
- 1983
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