We have investigated the 45 GHz microwave response from an organic superconductor λ-(BEDT-TSF) 2GaCl 4 with T c = 4.8 K. In the superconducting state, the London penetration depth saturates well below T c, which may provide an evidence for a conventional s-wave paring. In the metallic state, σ 1 c deviates downward from σ dc c, while σ 2 c, which should be zero in a conventional metallic state, increases exponentially toward T c. This anomalous metallic state has been discussed in terms of a possible formation of incoherent electron pairs in so-called a pseudogap state.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics