Explanation of the zero-bias anomaly in the tunneling characteristics of single-crystal Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} with intrinsic Josephson tunneling
- Laboratorium fuer Festkoerperphysik, Eidgenoessische Technische Hochschule--Hoenggerberg, CH-8093 Zuerich (Switzerland)
We present measurements of {ital dV}/{ital dI} and {ital V} vs {ital I} for Ag-single-crystal Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}-Ag NSN contacts. It was found that when the contact resistance was comparable to the sample resistance, zero-bias anomalies, as previously reported, were observed. We explain this observation by assuming that the sample contains intrinsic Josephson junctions between the CuO planes which become normal at higher current densities. We present a simple model based on this hypothesis which explains some aspects of the observed feature quantitatively. The effects of magnetic fields are also consistent with our observations. Recently, Josephson tunneling measurements have been used to determine the symmetry of the order parameter in YBa{sub 2}Cu{sub 3}O{sub 6.9}. We believe that the presence of intrinsic Josephson junctions will make such experiments extremely difficult to interpret for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 284395
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 21; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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