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Study of the proximity effect in Nb/Au, Bi2Sr2CaCu2O8+y/Au, and HgBa2CuO4/Ag using a scanning tunneling microscope (1996)

Zasadzinski, Roberta ; Vandervoort, K. G. ; Crabtree, G. W.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 7843-7848

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Proximity effect gaps were observed consistently in Nb/Au, Bi2Sr2CaCu2O8+y/Au, and HgBa2CuO4/Ag bilayers using a low temperature scanning tunneling microscope. The Nb/Au conductance curves [dI(V)/dV vs V] were fit by the Arnold model, using the accepted energy gap value of Nb, 1.55 meV. The application of gold and silver overlayers allowed vacuum tunneling and topographic images of BSCCO single crystals and the HgBa2CuO4 polycrystalline sample. Cleavage steps of varying sizes (up to 1500 A(ring)) in the BSCCO/Au sample were observed, and gaplike features were found on such steps. Consistent, reproducible energy gaps were also found in the Hg-compound sample. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.362373

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