Eur. Phys. J. Special Topics 188, 153-162 (2010)
https://doi.org/10.1140/epjst/e2010-01303-3

Review

An ARPES view on the high-T_c problem: Phonons vs. spin-fluctuations

¹ IFW Dresden, PO Box 270116, 01171 Dresden, Germany
² Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
³ Max-Planck-Institute for Solid State Research, 70569 Stuttgart, Germany

^a e-mail: kordyuk@gmail.com

Received: 14 July 2010
Revised: 12 August 2010
Published online: 11 October 2010

Abstract

We review the search for a mediator of high-T_c superconductivity focusing on ARPES experiment. In case of HTSC cuprates, we summarize and discuss a consistent view of electronic interactions that provides natural explanation of both the origin of the pseudogap state and the mechanism for high temperature superconductivity. Within this scenario, the spin-fluctuations play a decisive role in formation of the fermionic excitation spectrum in the normal state and are sufficient to explain the high transition temperatures to the superconducting state while the pseudogap phenomenon is a consequence of a Peierls-type intrinsic instability of electronic system to formation of an incommensurate density wave. On the other hand, a similar analysis being applied to the iron pnictides reveals especially strong electron-phonon coupling that suggests important role of phonons for high-T_c superconductivity in pnictides.