Superconducting Gap in the Hubbard Model and the Two-Gap Energy Scales of High-TcCuprate Superconductors

2007/02/28 by M. Aichhorn, Markus Aichhorn, E. Arrigoni +4 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Band gap #Condensed matter physics #Doping #Energy (signal processing) #Hubbard model #Iron-based superconductors research #Pairing #Photoemission spectroscopy #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Raman spectroscopy #Spectral line #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.99.257002

published as Phys. Rev. Lett. 99, 257002 (2007) · 4 pages, 5 figures, revised version to be published in Phys. Rev. Lett

arxiv created 2007/09/28 · openalex publication_date 2007/12/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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.

Citations

• Angle-resolved photoemission studies of the cuprate superconductors
• Competition between Antiferromagnetism and Superconductivity in High-TcCuprates
• Distinct doping dependences of the pseudogap and superconducting gap ofLa2−xSrxCuO4cuprate superconductors
• Pseudogaps and Their Interplay with Magnetic Excitations in the Doped 2D Hubbard Model
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Self-energy-functional approach to systems of correlated electrons
• The pseudogap in high-temperature superconductors: an experimental survey

Cited by

• Anomalous superconductivity and its competition with antiferromagnetism in doped Mott insulators
• Resilience ofd-wave superconductivity to nearest-neighbor repulsion
• Breakpoint in the evolution of the gap through the cuprate phase diagram