Intrinsic electron and hole bands in electron-doped cuprate superconductors
Journal Article
·
· Physical Review B
OSTI ID:972684
We propose that the upper Hubbard band (electron-like) and the Zhang-Rice singlet band (holelike) are two essential components in describing low-energy excitations of electron-doped cuprate superconductors. We find that the gap between these two bands is significantly smaller than the charge-transfer gap measured by optics and is further reduced upon doping. This indicates that the charge fluctuation is strong and the system is in the intermediate correlation regime. A two-band model is derived. In the limit that the intraband and interband hopping integrals are equal to each other, this model is equivalent to the unconstrained t-J model with on-site Coulomb repulsions.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 972684
- Report Number(s):
- SLAC-REPRINT-2010-007; TRN: US201005%%254
- Journal Information:
- Physical Review B, Vol. 79, Issue 1; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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