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Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Technik Elektronik, Elektro- und Nachrichtentechnik Josephson-Kontakt-Arrays aus Hochtemperatur-Supraleitern
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Josephson-Kontakt-Arrays aus Hochtemperatur-Supraleitern
Dominik Hanisch (Broschiert, Deutsch)
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Beschreibung
Josephson junctions are used as fundamental components within Primary standards for the definition of the electrical voltage. A series circuit, configured as an array of Josephson junctions, can generate quantized voltage levels, which are used for calibration purposes. In this study, Josephson junctions were created using grain boundaries or focused ion beams of Helium or gallium in the… high-temperature superconductor YBa2Cu3O6+x. The thin films were deposited by pulsed laser deposition and structured using an ion beam etching process. To further modify the width and thereby the parameters of the Josephson junctions, a structuring processwith focused gallium ions was characterized and successfully applied to grain boundary junctions. As a result, an overlapping Shapiro step at 6,464mV with an excitation frequency of 1,042 THz was generated in an array of three Josephson junctions in the THz microscope. Additionally, superconducting nanobridges with widths as small as 48nm were fabricated. For further multi-parametric characterization of the Josephson junctions, a cryogenic measurement setup with a pulse-tube cooler was designed and constructed. The entire mechanical and electrical setup, including a low-noise amplifier, was developed. A general characterization of the measurement setup was conducted using grain boundary junctions in magnetic and high-frequency fields. The noise suppression of the entire setup proved to be more than sufficient. Subsequently, measurements were carried out on various types of Josephson junctions. Grain boundary junctions with asymmetric Fraunhofer patterns exhibited unstable and chaotic behavior of the Shapiro steps in certain regions of the parameter space defined by the magnetic field and the power of the high-frequency excitation. Furthermore, so-called "zero-bias Shapiro steps" were observed for specific parameter combinations. In addition, an initial characterization of Josephson junctions produced by a focused helium ion beam was performed with regard to their use in arrays. Josephson junctions created by cuts with a focused gallium ion beam demonstrated pronounced Shapiro steps. Various nanobridges showed Josephson junctions with non-integer Shapiro steps or negative differential resistances in the current-voltage characteristics. Finally, the influence of photon absorption at a wavelength of 395 nm on a nanobridge made of YBa2Cu3O6+x was investigated. Dieses Produkt haben wir gerade leider nicht auf Lager.
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
Der Umwelt zuliebe
Technische Daten
Erscheinungsdatum
01.10.2025
Sprache
Deutsch
EAN
9783967292862
Herausgeber
Mensch & Buch
Serien- oder Bandtitel
Elektrische Messtechnik und Grundlagen der Elektrotechnik
Sonderedition
Nein
Autor
Dominik Hanisch
Seitenanzahl
154
Auflage
1
Einbandart
Broschiert
-.-
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