Kinetic energy change with doping upon superfluid condensation in high-temperature superconductors
Guy Deutscher, Andrés Felipe Santander-Syro, Nicole Bontemps
DOI 10.1103/PhysRevB.72.092504 · Physical Review B
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Abstract
In conventional BCS superconductors, the electronic kinetic energy increases upon superfluid condensation (the change ΔEkin is positive). Here we show that in the high critical temperature superconductor Bi2Sr2CaCu2O8+δ, ΔEkin crosses over from a fully compatible conventional BCS behavior (ΔEkin>0) to an unconventional behavior (ΔEkin<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 two such regimes around optimal doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 63 | Pressure not reported | unknown |
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