dx2−y2- versus dxy- like pairings in organic superconductors κ−(BEDT−TTF)2X
Kazuhiko Kuroki, Takashi Kimura, Ryotaro Arita, Yukio Tanaka, Yuji Matsuda
DOI 10.1103/PhysRevB.65.100516 · Physical Review B
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Abstract
Pairing symmetry in κ−(BEDT−TTF)2X is reexamined by applying the fluctuation exchange method to the Hubbard model on the original four-band lattice. Our study is motivated by the discrepancy between recent thermal conductivity/tunneling spectroscopy experiments and the previous theories based on the effective single or two-band model. In contrast to the previous theories, we find that dx2−y2-like pairing dominates over dxy in agreement with recent experiments. Our study provides a general lesson that even if the Fermi surface seems to be reproduced by an effective model, the pairing symmetry can be different from that of the original system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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