TY - JOUR
T1 - Kinetic energy change with doping upon superfluid condensation in high-temperature superconductors
AU - Deutscher, Guy
AU - Santander-Syro, Andrés Felipe
AU - Bontemps, Nicole
PY - 2005/9/1
Y1 - 2005/9/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=29744464075&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.72.092504
DO - 10.1103/PhysRevB.72.092504
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AN - SCOPUS:29744464075
SN - 1098-0121
VL - 72
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 9
M1 - 092504
ER -