Physics – Condensed Matter – Superconductivity
Scientific paper
2006-06-09
Solid State Communications 143, Fast Communications 447 (2007)
Physics
Condensed Matter
Superconductivity
6 pages, 4 figures. Corresponding author: Nai-Chang Yeh (ncyeh@caltech.edu)
Scientific paper
10.1016/j.ssc.2007.06.029
We investigate the low-energy quasiparticle excitation spectra of cuprate superconductors by incorporating both superconductivity (SC) and competing orders (CO) in the bare Green's function and quantum phase fluctuations in the proper self-energy. Our approach provides consistent explanations for various empirical observations, including the excess subgap quasiparticle density of states, ``dichotomy'' in the momentum-dependent quasiparticle coherence and the temperature-dependent gap evolution, and the presence (absence) of the low-energy pseudogap in hole- (electron-) type cuprates depending on the relative scale of the CO and SC energy gaps.
Beyer A. D.
Chen Chien-Tsu
Yeh N.-C.
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