Evidence of Josephson junctions in sintered YBa2Cu3O7 samples by means of microwave absorption in a low magnetic field
R. Marcon, R. Fastampa, M. Giura, C. Matacotta
DOI 10.1103/PhysRevB.39.2796 · Physical Review B
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Abstract
We present a set of experimental results of microwave absorption (23 GHz) in YBa2Cu3O7 sintered samples in the presence of an external magnetic field H below 0.1 T. The field dependence in this region may be understood assuming the existence of a random network of Josephson junctions (JJ). The most important experimental facts resulting from our measurements are an exponential-like behavior for the power absorption as a function of the magnetic field H, the existence of a critical temperature TcJ clearly below Tc above which the exponential absorption is no longer present, the behavior as a function of the temperature of a field Hd(T) which is interpreted as a junction dephasing field. We show that the JJ model allows a quantitative fit of the experimental data when a statistical distribution for the junction geometrical parameters is chosen.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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