Condensed Matter Physics Seminar
Thursday, December 9, 1999, 2 p.m.
Plant Sciences Building, Room 1130
High Resolution Photoemission Studies of Optimally Doped Bi2Sr2CaCu2O8+d:
Nodal
Quasiparticles or No Quasiparticles?
Peter Johnson
(Physics Department, Brookhaven National Laboratory)
Abstract: Recent instrumentation developments in photoemission
are providing new insights into the physics of complex materials.
With increased energy and momentum resolution, it has become possible to
examine in detail different contributions to the self-energy or inverse
lifetime of the photohole created in the photoexcitation process.
In studies of a metallic surface state on Mo it is possible to isolate
and identify the electron-electron, electron-phonon and electron-impurity
scattering contributions to the quasi-particle lifetime. In contrast,
employing momentum distribution and energy distribution curves, a detailed
study of the optimally doped high Tc superconductor, Bi2Sr2CaCu2O8+d,
shows that the material behaves like a non-Fermi liquid with no evidence
for the quasi-particles characteristic of a Fermi liquid.
Host: Dennis Drew
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