Microwave oscillations in superconducting tunnel mesa structures under spin filtration conditions
The production of microwave oscillations in thin-film tunnel mesa structures consisting of an epitaxial film of cuprate superconductor YBa2Cu3O7-x, a barrier layer of manganite LaMnO3, and an upper superconducting Au/Nb bilayer is studied experimentally. The frequency of the detected microwaves is t...
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Veröffentlicht in: | Low temperature physics (Woodbury, N.Y.) N.Y.), 2018-03, Vol.44 (3), p.199-202 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The production of microwave oscillations in thin-film tunnel mesa structures consisting of an epitaxial film of cuprate superconductor YBa2Cu3O7-x, a barrier layer of manganite LaMnO3, and an upper superconducting Au/Nb bilayer is studied experimentally. The frequency of the detected microwaves is tuned by the bias voltage and an external magnetic field, and the linewidth is 50 MHz. Conductivity peaks are detected in the mesa structure at voltages corresponding to the niobium gap and a resistance peak at V = 0. When the temperature is lowered to below the critical temperature of niobium, an increase in the resistance peak is observed for zero bias and the tunneling magnetoresistance is 10% for a field H = 0.5 kOe, which can be explained by the effect of the spin-polarized current on the resistive characteristics of the mesa structure. The magnetic characteristics of the manganite spacer in the mesa structures are studied by FMR spectroscopy of Au/LaMnO3/YBa2Cu3O7-x heterostructures. |
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ISSN: | 1063-777X 1090-6517 |
DOI: | 10.1063/1.5024535 |