Evolution of the Fermi surface with carrier concentration in Bi_2Sr_2CaCu_2O_{8+δ}

Abstract

We show, by use of angle-resolved photoemission spectroscopy, that underdoped Bi_2Sr_2CaCu_2O_{8+δ} appears to have a large Fermi surface centered at (π,π), even for samples with a T_c as low as 15 K. No clear evidence of a Fermi surface pocket around (π/2,π/2) has been found. These conclusions are based on a determination of the minimum gap locus in the pseudogap regime T_c < T < T^*, which is found to coincide with the locus of gapless excitations in momentum space (Fermi surface) determined above T^*. These results suggest that the pseudogap is more likely of precursor pairing rather than magnetic origin.

4 pages, revtex, 4 postscript color figures

References in corpus (4)

• ARPES Study of the Superconducting Gap Anisotropy in Bi_2Sr_2CaCu_2O_8+x
• Electronic excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$ : Fermi surface, dispersion, and absence of bilayer splitting
• Deviations from Fermi-liquid behavior above $T_c$ in 2D short coherence length superconductors
• Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission

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