Normal-state pseudogap in the spectrum of strongly correlated fermions
- Institute of Physics, Riia 142, EE-2400 Tartu (Estonia)
- Institut fuer Physik, Technische Universitaet, D-09107 Chemnitz (Federal Republic of Germany)
Recently a pseudogap with d-wave symmetry was observed near the Fermi level in photoemission spectra of normal-state Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} crystals. We demonstrate that an analogous pseudogap exists in the energy spectrum of the two-dimensional t-J model of cuprate perovskites. In agreement with experiment the magnitude of the pseudogap is 10{endash}20 meV in underdoped crystals with hole concentration x{approx_lt}0.17 and the pseudogap disappears in optimally and overdoped crystals when x{approx_gt}0.17. We demonstrate also that in the t-J model the overall energy spectrum near the Fermi level and the Fermi surface agree well with experimental observations. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 471179
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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