Electron tunneling into single crystals of YBa2Cu3O7-

J. M. Valles, R. C. Dynes, A. M. Cucolo, M. Gurvitch, L. F. Schneemeyer, J. P. Garno, J. V. Waszczak

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We have fabricated tunnel junctions between chemically etched single crystals of YBa2Cu3O7- and evaporated metal counterelectrodes that exhibit reproducible characteristics. Above the bulk critical temperature of YBa2Cu3O7-, Tc, the conductance as a function of voltage, G(V), has a linear dependence on voltage and some asymmetry. Below Tc, additional structure associated with the superconducting state appears in G(V). At TTc there is a reproducible finite zero-bias conductance, which suggests that there are states at the Fermi energy in superconducting YBa2Cu3O7-. Junctions with Pb, Sn, Bi, Sb, PbBi, and Au counterelectrodes all show qualitatively similar behavior.

Original languageEnglish
Pages (from-to)11986-11996
Number of pages11
JournalPhysical Review B
Issue number21
StatePublished - 1 Jan 1991

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    Valles, J. M., Dynes, R. C., Cucolo, A. M., Gurvitch, M., Schneemeyer, L. F., Garno, J. P., & Waszczak, J. V. (1991). Electron tunneling into single crystals of YBa2Cu3O7-. Physical Review B, 44(21), 11986-11996. https://doi.org/10.1103/PhysRevB.44.11986