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Life of the nodal quasiparticles in Bi-2212 as seen by ARPES
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Life of the nodal quasiparticles in Bi-2212 as seen by ARPES
A. A. Kordyuk,1, 2 S. V. Borisenko,1 A. Koitzsch,1 J. Fink,1 M. Knupfer,1 B. Bu?chner,1 and H. Berger3
1Institute for Solid State Research, IFW-Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany
2Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
3Institute of Physics of Complex Matter, EPFL, CH-1015 Lausanne, Switzerland
(Dated: April 30, 2004)
While the pronounced doping dependence of the quasiparticle spectral weight in the antinodal
region of the superconducting cuprates, as seen by ARPES, unambiguously points to the magnetic
origin of the strong electron-boson coupling there, the nature of the electron scattering in the nodal
direction remained unclear. Here we present a short review of our recent detailed investigations of
the nodal direction of Bi-2212. Our findings prove the existence of well defined quasiparticles even
in the pseudogap state and show that the essential part of the quasiparticle scattering rate, which
appears on top of Auger-like electron-electron interaction, also implies a magnetic origin.
PACS numbers: 74.25.Jb, 74.72.Hs, 79.60.-i, 71.15.Mb
I. ARPES VIEW
Angle-resolved photoemission spectroscopy (ARPES)
[1] provides a direct view on the density of low energy
electronic excited states in solids—the 2D detector of
the electron analysers used in modern ARPES is just a
window into momentum-energy space of 2D compounds.
A snapshot through this window stores the quasiparti-
cle spectral weight in the momentum-energy co-ordinates
[2, 3, 4, 5]. Being essentially two-dimensional, the su-
perconducting cuprates are a perfect example of the
”arpesable” compounds [1]. All the interactions of the
electrons which are responsible for their unusual normal
and superconducting properties are encapsulated in such
snapshots, and success in understan
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