Ultrafast broadband transient reflectivity experiments are performed to study the interplay between the nonequilibrium dynamics of the pseudogap and the superconducting phases in Bi2Sr2Ca0.92Y 0.08Cu2O8+δ. Once superconductivity is established, the relaxation of the pseudogap proceeds ∼2 times faster than in the normal state, and the corresponding transient reflectivity variation changes sign after ∼0.5 ps. The results can be described by a set of coupled differential equations for the pseudogap and for the superconducting order parameter. The sign and strength of the coupling term suggest a remarkably weak competition between the two phases, allowing their coexistence. © 2013 American Physical Society.
Competition between the pseudogap and superconducting states of Bi 2Sr2Ca0.92Y0.08Cu2O 8+δ single crystals revealed by ultrafast broadband optical reflectivity
DAL CONTE, STEFANO;
2013-01-01
Abstract
Ultrafast broadband transient reflectivity experiments are performed to study the interplay between the nonequilibrium dynamics of the pseudogap and the superconducting phases in Bi2Sr2Ca0.92Y 0.08Cu2O8+δ. Once superconductivity is established, the relaxation of the pseudogap proceeds ∼2 times faster than in the normal state, and the corresponding transient reflectivity variation changes sign after ∼0.5 ps. The results can be described by a set of coupled differential equations for the pseudogap and for the superconducting order parameter. The sign and strength of the coupling term suggest a remarkably weak competition between the two phases, allowing their coexistence. © 2013 American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
