The European Physical Journal Special Topics

, Volume 188, Issue 1, pp 153-162

First online:

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

  • A.A. KordyukAffiliated withIFW DresdenInstitute of Metal Physics of National Academy of Sciences of Ukraine Email author 
  • , V.B. ZabolotnyyAffiliated withIFW Dresden
  • , D.V. EvtushinskyAffiliated withIFW Dresden
  • , D.S. InosovAffiliated withMax-Planck-Institute for Solid State Research
  • , T.K. KimAffiliated withIFW Dresden
  • , B. BüchnerAffiliated withIFW Dresden
  • , S.V. BorisenkoAffiliated withIFW Dresden

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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.