Kinetic energy change with doping upon superfluid condensation in high temperature superconductors

Details Kinetic energy change with doping upon superfluid condensation in high temperature superconductors Kinetic energy change with doping upon superfluid condensation in high temperature superconductors

2005-03-03

arxiv.org/abs/cond-mat/0503073v1

Phys. Rev. B 72, 092504 (2005)

Physics

Condensed Matter

Superconductivity

3 pages, 2 figures

Scientific paper

10.1103/PhysRevB.72.092504

In conventional BCS superconductors, the electronic kinetic energy increases upon superfluid condensation (the change DEkin is positive). Here we show that in the high critical temperature superconductor Bi-2212, DEkin crosses over from a fully compatible conventional BCS behavior (DEkin>0) to an unconventional behavior (DEkin<0) as the free carrier density decreases. If a single mechanism is responsible for superconductivity across the whole phase diagram of high critical temperature superconductors, this mechanism should allow for a smooth transition between such two regimes around optimal doping.

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