paper

Transverse and in-plane modification of superconductivity and electronic structure in the quasi-two dimensional organic conductor $I^º$ --(BEDT-TTF) $_{2}$ Cu(SCN) $_{2}$ by uniaxial stress

arXiv:cond-mat/0008348 · doi:10.1080/13642810110033827

Abstract

We have employed uniaxial stress along the principal axes of the quasi-two dimensional organic superconductor $I^º$ --(BEDT-TTF) $_{2}$ Cu(SCN) $_{2}$ . The lattice anisotropy is thereby altered, with corresponding changes in the intermolecular transfer energies. The effect of uniaxial stress on the superconducting transition temperature $T_{c}$ and critical field $B_{c 2}$ is found to be anisotropic.There is an indication of an increase in $T_{c}$ and $B_{c 2}$ for in-plane stress, but both parameters decrease rapidly for transverse (inter-plane) stress. Magnetotransport studies reveal stress-induced changes in the Fermi surface through the observation of the Shubnikov de Haas oscillations. The stress dependence of a resistive anomaly in the magnetoresistance, which is associated with the critical field $B_{c 2}$ , is also investigated. We discuss the experimental findings in the context of recent phenomenological and theoretical treatments of quasi-two dimensional systems where the anisotropic triangular lattice Hubbard model has been used to treat two-dimensional superconductors.

10 pages, two tables, 14 figures

Transverse and in-plane modification of superconductivity and electronic structure in the quasi-two dimensional organic conductor I^º--(BEDT-TTF)2​Cu(SCN)2​ by uniaxial stress

Abstract

Transverse and in-plane modification of superconductivity and electronic structure in the quasi-two dimensional organic conductor $I^º$ --(BEDT-TTF) $_{2}$ Cu(SCN) $_{2}$ by uniaxial stress