Low Temperature Physics: 32, 298 (2006); https://doi.org/10.1063/1.2199429 (7 pages)
Физика Низких Температур: Том 32, Выпуск 4-5 (Апрель 2006), c. 401-410 ( к оглавлению , назад )
ARPES on high-temperature superconductors:simplicity vs. complexity
A.A. Kordyuk1,2 and S.V. Borisenko2
1Institute of Metal Physics of the National Academy of Sciences of Ukraine 36 Vernadsky Str., Kiev, 03142 Ukraine
2Institute for Solid State Research, IFW-Dresden, Dresden, D-01069 Germany
Received September 1, 2005
A notable role in understanding of microscopic electronic properties of high temperature superconductors
(HTSC) belongs to angle resolved photoemission spectroscopy (ARPES). This technique supplies a direct window into the reciprocal space of solids: the momentum–energy space
where quasiparticles (electrons dressed in clouds of interactions) dwell. Any interaction in the
electronic system, e.g., superconducting pairing, leads to modification of the quasiparticle spectrum— to redistribution of the spectral weight over the momentum–energy space probed by ARPES. Continued development of the technique had the effect that the picture seen through the ARPES window became clearer and sharper until the complexity of the electronic band structure of the cuprates had been resolved. Now, in the doping range optimal for superconductivity, the cuprates much resemble a normal metal with well-predicted electronic structure, though with
rather strong electron–electron interaction. This principal disentanglement of the complex physics from complex structure reduced the mystery of HTSC to the tangible problem of the interaction responsible for quasiparticle formation. Here we present a short overview of resent ARPES results, which, we believe, suggest a way to resolve the HTSC puzzle.
Ключевые слова: high-Tc superconductivity, ARPES method, HTSC cuprates.