Transport and spectroscopic properties of superconductor/ferromagnet/superconductor junctions of La1.9Sr0.1CuO4/La0.67Ca0.33MnO3/La1.9Sr0.1CuO4
G. Koren, T. Kirzhner
DOI 10.1103/PhysRevB.84.134517 · Physical Review B
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Abstract
Transport and conductance spectra measurements of ramp-type junctions made of cuprate superconducting La1.9Sr0.1CuO4 electrodes and a manganite ferromagnetic La0.67Ca0.33MnO3 barrier are reported. No supercurrents were observed in junctions with a barrier thickness of 12 nm or more, which suggests that no long-range proximity induced triplet superconductivity exists in the ferromagnetic barrier of the present junctions. At low temperatures below Tc, the conductance spectra show Andreev-like broad peaks superposed on a tunneling-like background and sometimes also subgap Andreev resonances. The energy gap values, Δ, found from fits of the data ranged mostly between 7–10 mV. As usual, the gap features were suppressed under magnetic fields but revealed the tunneling-like conductance background. After field cycling to 5 or 6 T and back to 0 T, the conductance spectra were always higher than under zero-field cooling, reflecting the negative magnetoresistance of the manganite barrier. Observed critical currents were shown to be an artifact due to incomplete milling of one of the superconducting electrodes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.9Sr0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
| La1.9Sr0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | onset |
| YBa2Cu3O7-δ 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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