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Luca PERFETTI - Laboratoire des Solides Irradiés

Electron-phonon coupling and pseudogap in high temperature superconductors


 

I will review some of the open questions concerning the mechanism of high temperature superconductivity. Our approach makes use of non-equilibrium techniques in order to disentangle electronic degrees of freedom from lattice modes. I will discuss in detail the time resolved photoemission technique and time resolved THz spectroscopy. These experiments provide novel information on the elementary interactions dressing the quasiparticles as well as on the calorimetry of the electrons. The relaxation time of the photoexcited state indicates that the electron-phonon coupling is too weak in order to provide the pairing interaction. Simple considerations based on the energy conservation allow for an extraction of the electronic specific heat over a wide temperature range. Based on these results, I will discuss the phase diagram and the occurrence of a pseudogap in underdoped compounds.

 

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