Protected nodes and the collapse of the Fermi arcs in high Tc cuprates

Details Protected nodes and the collapse of the Fermi arcs in high Tc cuprates Protected nodes and the collapse of the Fermi arcs in high Tc cuprates

2007-08-30

arxiv.org/abs/0708.4099v1

Phys. Rev. Lett 99, 157001 (2007)

Physics

Condensed Matter

Superconductivity

Accepted by Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.157001

Angle resolved photoemission on underdoped Bi2Sr2CaCu2O8 reveals that the magnitude and d-wave anisotropy of the superconducting state energy gap are independent of temperature all the way up to Tc. This lack of T variation of the entire k-dependent gap is in marked contrast to mean field theory. At Tc the point nodes of the d-wave gap abruptly expand into finite length ``Fermi arcs''. This change occurs within the width of the resistive transition, and thus the Fermi arcs are not simply thermally broadened nodes but rather a unique signature of the pseudogap phase.

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