We performed tunneling spectroscopy on high quality superconducting YNdxBa2-xCu3O7-delta thin films using a low-temperature scanning tunneling microscope. Superconducting regions show very well-defined gap structures. Disorder introduced by Nd substitution at the Ba site dramatically affects locally the quasiparticle density of states. The measurements show that the impurities induce surface resonant states at energies very close to the Fermi energy, typical of a d-wave superconductor.
STM tunneling spectroscopic studies of YNdxBa2−xCu3O7−δ thin films / Iavarone, M.; Salluzzo, M.; DI CAPUA, Roberto; Maglione, M. G.; Vaglio, Ruggero; Karapetrov, G.; Kwok, W. K.; Crabtree, G. W.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 65:21(2002), pp. 214506-1-214506-5. [10.1103/PhysRevB.65.214506]
STM tunneling spectroscopic studies of YNdxBa2−xCu3O7−δ thin films
DI CAPUA, ROBERTO;VAGLIO, RUGGERO;
2002
Abstract
We performed tunneling spectroscopy on high quality superconducting YNdxBa2-xCu3O7-delta thin films using a low-temperature scanning tunneling microscope. Superconducting regions show very well-defined gap structures. Disorder introduced by Nd substitution at the Ba site dramatically affects locally the quasiparticle density of states. The measurements show that the impurities induce surface resonant states at energies very close to the Fermi energy, typical of a d-wave superconductor.| File | Dimensione | Formato | |
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