By imaging in air the (001) surfaces of YBa2Cu3O7-delta single crystals etched in dilute CH3OH:Br2 solution with scanning tunneling microscopy we have observed etch pits and followed their modification with time. The current-voltage characteristics of the junction are measured and described in terms of electron tunneling through a trapezoidal potential barrier of average thickness (approximately 25 angstrom). Such a barrier results from the passivated layer formed on the superconductor surface exposed to room air after the etching. The superconductor surface is metallic. The normalized conductance G(V) measured at room temperature is that of a metal-insulator-metal junction except at small bias. Sharp peaks assigned to local density-of-states features within 1 eV from the Fermi level are observed.

Balzarotti, A., Patella, F., Motta, N., Cucolo, A., Di Leo, R., DE CRESCENZI, M. (1992). Etch pits and tunnel barrier in chemically etched YBa2Cu3O7-[delta] crystals by scanning tunneling microscopy. PHYSICA. C, SUPERCONDUCTIVITY, 200(3-4), 251-256 [10.1016/0921-4534(92)90374-L].

Etch pits and tunnel barrier in chemically etched YBa2Cu3O7-[delta] crystals by scanning tunneling microscopy

BALZAROTTI, ADALBERTO;PATELLA, FULVIA;DE CRESCENZI, MAURIZIO
1992-01-01

Abstract

By imaging in air the (001) surfaces of YBa2Cu3O7-delta single crystals etched in dilute CH3OH:Br2 solution with scanning tunneling microscopy we have observed etch pits and followed their modification with time. The current-voltage characteristics of the junction are measured and described in terms of electron tunneling through a trapezoidal potential barrier of average thickness (approximately 25 angstrom). Such a barrier results from the passivated layer formed on the superconductor surface exposed to room air after the etching. The superconductor surface is metallic. The normalized conductance G(V) measured at room temperature is that of a metal-insulator-metal junction except at small bias. Sharp peaks assigned to local density-of-states features within 1 eV from the Fermi level are observed.
1992
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
Ceramic materials; Crystals; Electron tunneling; Scanning electron microscopy; Yttrium compounds; Chemical etching; Oxide superconductors; Scanning tunneling microscopy; Yttrium barium copper oxides; High temperature superconductors
Balzarotti, A., Patella, F., Motta, N., Cucolo, A., Di Leo, R., DE CRESCENZI, M. (1992). Etch pits and tunnel barrier in chemically etched YBa2Cu3O7-[delta] crystals by scanning tunneling microscopy. PHYSICA. C, SUPERCONDUCTIVITY, 200(3-4), 251-256 [10.1016/0921-4534(92)90374-L].
Balzarotti, A; Patella, F; Motta, N; Cucolo, A; Di Leo, R; DE CRESCENZI, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/45649
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