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Accueil > Séminaires > Séminaires passés > Séminaires de 2011 > What lies below the superconducting dome ?

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Giovanni Sordi (ILL, Grenoble)

What lies below the superconducting dome ?

Mercredi 12 Janvier 2011 à 14h15

The discovery of quantum oscillations in layered high-temperature
superconductors has brought renewed attention to the normal state below
the superconducting dome. The challenge is to understand the evolution
from the conventional metal at high doping to the Mott insulator at zero
doping. To this end, we solve the cellular dynamical mean-field equations
for the two-dimensional Hubbard model on a plaquette with continuous-time
quantum Monte Carlo method. The normal-state phase diagram as a function
of temperature T, interaction strength U, and filling n reveals that, upon
increasing n towards the Mott insulator, there is a surface of first-order
transition between two metals at nonzero doping. That surface ends at a
finite temperature critical line originating at the half-filled Mott
critical point. Associated with this transition, there is a maximum in
scattering rate. These findings suggest a new scenario for the
normal-state phase diagram of the high temperature superconductors. The
criticality surmised in these systems can originate not from a T=0 quantum
critical point, nor from the proximity of a long-range ordered phase, but
from a low temperature transition between two types of metals at finite
doping. The influence of Mott physics extends well beyond half-filling.
Ref : G. Sordi, K. Haule, and A.-M.S. Tremblay, Phys. Rev. Lett. 104,
226402 (2010).