ARPES on high-temperature superconductors: simplicity vs. complexity

• Published in: Физика низких температур
• Date: 2006
• Main Authors: Kordyuk, A.A., Borisenko, S.V.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
• Subjects: General Aspects
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/120184
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: ARPES on high-temperature superconductors:
 simplicity vs. complexity / A.A. Kordyuk, S.V. Borisenko // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 401-410. — Бібліогр.: 57 назв. — англ.

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.