The ARPES Pseudogap and Anomalous Background of Underdoped BiSCO 2212 as Evidence for a Fermi Level Band Crossing

Details The ARPES Pseudogap and Anomalous Background of Underdoped BiSCO 2212 as Evidence for a Fermi Level Band Crossing The ARPES Pseudogap and Anomalous Background of Underdoped BiSCO 2212 as Evidence for a Fermi Level Band Crossing

1999-08-22

arxiv.org/abs/cond-mat/9908308v2

Physics

Condensed Matter

Superconductivity

submitted to Phys. Rev. Lett., major changes to text to meet length requirements and increase clarity, see www.firstprinciples

Scientific paper

We show that the unusual observations of a pseudogap in the normal state of underdoped Bi_2Sr_2CaCu_2O_8+delta (BiSCO) using angle resolved photoemission spectroscopy (ARPES) is consistent with a new band structure for the cuprate superconductors in which the x2-y2 and z2 bands are seen to cross at the Fermi level. Limitations in the experimental method prevent the narrow 3D z2 band from being fully resolved, leading instead to a broad background with "stepfunction" character. As a consequence, the Fermi surface is mis-assigned and a pseudogap of approximately d-wave symmetry develops.

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