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

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

1996-11-25

arxiv.org/abs/cond-mat/9611194v1

Phys Rev Lett 78, 2628 (1997)

Physics

Condensed Matter

Superconductivity

4 pages, revtex, 4 postscript color figures

Scientific paper

10.1103/PhysRevLett.78.2628

We show, by use of angle-resolved photoemission spectroscopy, that underdoped Bi_2Sr_2CaCu_2O_{8+\delta} appears to have a large Fermi surface centered at (\pi,\pi), even for samples with a T_c as low as 15 K. No clear evidence of a Fermi surface pocket around (\pi/2,\pi/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.

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