Evidence for coexistence of the superconducting gap and the pseudogap in Bi-2212 from intrinsic tunneling spectroscopy.
We present intrinsic tunneling spectroscopy measurements on small Bi2Sr2CaCu2O8+x mesas. The tunnel conductance curves show both sharp peaks at the superconducting gap voltage and broad humps representing the c-axis pseudogap. The superconducting gap vanishes at Tc, while the pseudogap exists both above and below Tc. Our observation implies that the superconducting and pseudogaps represent different coexisting phenomena.
Krasnov
V M
VM
Department of Microelectronics and Nanoscience, Chalmers University of Technology, S-41296 Göteborg, Sweden.
Yurgens
A
A
Winkler
D
D
Delsing
P
P
Claeson
T
T