Abstract
Ambient-pressure superconductivity has now been discovered in five systems based on BEDT-TTF:X, X - = polyatomic, monovalent anion. The highest T c reported is 5 K, in (BEDT-TTF) 2 AuI 2 , and it appears that much higher T c 's are possible if disorder (molecular and anionic), and structural modulation, can be avoided in new derivatives containing monovalent triatomic anions. A modulated structure has been observed in (BEDT-TTF) 2 1, using neutron and X-ray scattering, but does not appear to form in (BEDT-TFF) 2 X, X = I 2 Br - , AuI - 2 and IBr2 down to T = 10-20 K.
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