PMID:18233549
| Citation |
Aichhorn, M, Arrigoni, E, Huang, ZB and Hanke, W (2007) Superconducting gap in the hubbard model and the two-gap energy scales of high-T{c} cuprate superconductors. Phys. Rev. Lett. 99:257002 |
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| Abstract |
Recent experiments (angle-resolved photoemission spectroscopy and Raman) suggest the presence of two distinct energy gaps in high-temperature superconductors (HTSC), exhibiting different doping dependences. The results of a variational cluster approach to the superconducting state of the two-dimensional Hubbard model are presented which show that this model qualitatively describes this gap dichotomy. The antinodal gap increases with less doping, a behavior long considered as reflecting the general gap behavior of the HTSC. On the other hand, the near-nodal gap does even slightly decrease with underdoping. An explanation of this unexpected behavior is given which emphasizes the crucial role of spin fluctuations in the pairing mechanism. |
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