NMR investigations of the organic metals and superconductors α-(BEDT-TTF)2I3, β-(BEDT-TTF)2I3 and α t-(BEDT-TTF)2I3

Ingolf Hennig, Ulrich Haeberlen, Ilsabe Heinen, Dieter Schweitzer & Heimo J. Keller
1H and 13C spin lattice relaxation rates as well as 13C Knight shifts of the quasi two dimensional organic metals α-, β- and αt-(BEDT-TTF)2I3 are reported. In β- and αt-(BEDT-TTF)2I3 at temperatures below 100 K the Korringa relation is fulfilled. Near the critical temperature of 8K of the stable superconducting state of αt-(BEDT-TTF)2I3 an enhancement of the proton spin lattice relaxation rate due to superconducting fluctuations is observed. The observed individual 13C Knight shifts, as...
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