Abstract

Angle-dependent studies of the gap function provide evidence for the coexistence of two distinct gaps in hole doped cuprates, where the gap near the nodal direction scales with the superconducting transition temperature Tc, while that in the antinodal direction scales with the pseudogap temperature. We present model calculations which show that most of the characteristic features observed in the recent angle-resolved photoemission spectroscopy (ARPES) as well as scanning tunneling microscopy (STM) two-gap studies are consistent with a scenario in which the pseudogap has a non-superconducting origin in a competing phase. Our analysis indicates that, near optimal doping, superconductivity can quench the competing order at low temperatures, and that some of the key differences observed between the STM and ARPES results can give insight into the superlattice symmetry of the competing order.

Notes

Originally posted at http://arxiv.org/abs/0711.0480v2. Preprint of an article published in Physical Review B, v.77 no.13, 2008.

Keywords

gap function, hole doped cuprates, ARPES, STM

Subject Categories

Superconductivity, Photoemission

Disciplines

Physics

Publication Date

2008

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