We studied the superconducting transition temperature TC of β-(BEDT-TTF)2I3 in the high-TC phase under uniaxial strain. By embedding the crystal into epoxy resin, 8 K superconducting phase is stabilized. By applying uniaxial compression, further TC increase taking a maximum at a piston pressure of 3-4 kbar is observed for both directions parallel and perpendicular to the donor stack. The behavior is understood as a competition between the electron correlation (U dimer/W) and spin frustration (t'/t) in terms of the spin-fluctuation mediated superconductivity on the dimerized triangular lattice Hubbard model.
- Spin frustration
- Uniaxial strain
- β-type BEDT-TTF salt
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering