Coexistence of Fermi arcs and Fermi pockets in a high Tc copper oxide superconductor

Details Coexistence of Fermi arcs and Fermi pockets in a high Tc copper oxide superconductor Coexistence of Fermi arcs and Fermi pockets in a high Tc copper oxide superconductor

2009-06-15

arxiv.org/abs/0906.2682v2

Nature. 462 (2009) 335

Physics

Condensed Matter

Superconductivity

11 pages,4 figures

Scientific paper

In the pseudogap state of the high-Tc copper-oxide (cuprate) superconductors, angle-resolved photoemission (ARPES) measurements have seen an Fermi arc, i.e., an open-ended gapless section in the large Fermi surface, rather than a closed loop expected of an ordinary metal. This is all the more puzzling because Fermi pockets (small closed Fermi surface features) have been suggested from recent quantum oscillation measurements. The Fermi arcs have worried the high-Tc community for many years because they cannot be understood in terms of existing theories. Theorists came up with a way out in the form of conventional Fermi surface pockets associated with competing order, with a back side that is for detailed reasons invisible by photoemission. Here we report ARPES measurements of La-Bi2201 that give direct evidence of the Fermi pocket. The charge carriers in the pocket are holes and the pockets show an unusual dependence upon doping, namely, they exist in underdoped but not overdoped samples. A big surprise is that these Fermi pockets appear to coexist with the Fermi arcs. This coexistence has not been expected theoretically and the understanding of the mysterious pseudogap state in the high-Tc cuprate superconductors will rely critically on understanding such a new finding.

Affiliated with

Also associated with

No associations

Rating

Coexistence of Fermi arcs and Fermi pockets in a high Tc copper oxide superconductor does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coexistence of Fermi arcs and Fermi pockets in a high Tc copper oxide superconductor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coexistence of Fermi arcs and Fermi pockets in a high Tc copper oxide superconductor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-316046