The superconducting gap in the Hubbard model and the two gap energy scales in high-Tc cuprates

Details The superconducting gap in the Hubbard model and the two gap energy scales in high-Tc cuprates The superconducting gap in the Hubbard model and the two gap energy scales in high-Tc cuprates

2007-02-16

arxiv.org/abs/cond-mat/0702391v2

Phys. Rev. Lett. 99, 257002 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, revised version to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.257002

Recent excperiments (ARPES, Raman) suggest the presence of two distinct energy gaps in high-Tc superconductors (HTSC), exhibiting different doping dependences. 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: One gap (antinodal) 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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