Antiferromagnetism and Superconductivity in layered organic conductors: Variational cluster approach

Details Antiferromagnetism and Superconductivity in layered organic conductors: Variational cluster approach Antiferromagnetism and Superconductivity in layered organic conductors: Variational cluster approach

2006-04-03

arxiv.org/abs/cond-mat/0604057v2

Phys. Rev. Lett. 97, 257004 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Investigation of the d_xy phase added + discussion of gap symmetry

Scientific paper

The $\kappa$-(ET)$_2$X layered conductors (where ET stands for BEDT-TTF) are studied within the dimer model as a function of the diagonal hopping $t^\prime$ and Hubbard repulsion $U$. Antiferromagnetism and d-wave superconductivity are investigated at zero temperature using variational cluster perturbation theory (V-CPT). For large $U$, N\'eel antiferromagnetism exists for $t' < t'_{c2}$, with $t'_{c2}\sim 0.9$. For fixed $t'$, as $U$ is decreased (or pressure increased), a $d_{x^2-y^2}$ superconducting phase appears. When $U$ is decreased further, the a $d_{xy}$ order takes over. There is a critical value of $t'_{c1}\sim 0.8$ of $t'$ beyond which the AF and dSC phases are separated by Mott disordered phase.

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