Observation of the pseudogap in the heavily overdoped high-temperature superconductorP. S. Häfliger, A. Podlesnyak, K. Conder, E. Pomjakushina and A. Furrer
Laboratory for Neutron Scattering, ETH Zurich & PSI Villigen CH-5232 Villigen PSI, Switzerland
(Received 7 May 2004; accepted in final form 27 July 2004)
We studied the relaxation behavior of crystal-field transitions in the heavily overdoped high-temperature superconductor ( ) by neutron spectroscopic experiments. There is clear evidence for the opening of the pseudogap at and for the and compound, respectively. The fact that the pseudogap phenomenon extends far into the overdoped region supports the theoretical view of the existence of preformed pairs at .
74.72.Dn - -based cuprates.
76.30.Kg - Rare-earth ions and impurities.
78.70.Nx - Neutron inelastic scattering.
© EDP Sciences 2004