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APS » Journals » Phys. Rev. B » Volume 65 » Issue 21
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Phys. Rev. B 65, 214506 (2002) [5 pages]

STM tunneling spectroscopic studies of YNdxBa2-xCu3O7-δ thin films

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M. Iavarone1,2, M. Salluzzo1, R. Di Capua1, M. G. Maglione1, R. Vaglio1, G. Karapetrov2, W. K. Kwok2, and G. W. Crabtree2
1INFM–University of Naples Federico II, Dipartimento di Scienze Fisiche, Piazzale Tecchio 80, 80125 Naples, Italy
2Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439

Received 13 June 2001; published 22 May 2002

We performed tunneling spectroscopy on high quality superconducting YNdxBa2-xCu3O7-δ 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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.214506
DOI:
10.1103/PhysRevB.65.214506
PACS:
74.76.Bz, 68.37.Ef, 68.55.Ln
 
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