2003/04/21 by Hiroshi Kontani · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Magnetism in coordination complexes #Organic and Molecular Conductors Research #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.67.180503
4 pages, to be publisede in Physical Review B Rapid Communications
arxiv created 2003/04/21 · openalex publication_date 2003/05/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present a theoretical study on the superconductivity in \ensuremathβ^\ensuremath'\ensuremath-(BEDT\ensuremath-TTF)2ICl2 at Tc=14.2K under high hydrostatic pressure, which was recently found by Taniguchi et al. and is the highest recorded for organic superconductors. Its electronic structure is well expressed by the anisotropic triangular lattice Hubbard model at half filling. In the present paper, we study this effective model by using the fluctuation-exchange approximation. In the obtained phase diagram, the superconductivity with d_x2\mathrm\ensuremath-y2 like symmetry is realized next to the antiferromagnetic insulating phase, as a result of the one-dimensional--two-dimensional crossover driven by the pressure. The obtained maximum Tc is 16--18 K. In addition, the superconductivity in \ensuremathβ\ensuremath-(BEDT\ensuremath-TTF)2X is also understood in the same framework.