Hofer, Juan A. (2023) Crecimiento, caracterizacin y aplicaciones de las lminas delgadas basadas en superconductores desordenados / Growth characterization and applications of thin films based on disordered superconductors. Tesis Doctoral en Fsica, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en espaol
Este trabajo es un estudio experimental enfocado en la fabricacin y caracterizacin de lminas delgadas de materiales superconductores desordenados en vista de aplicaciones en sensores criognicos de radiacin y junturas Josephson. Los materiales involucrados estn basados principalmente en dos metales de transicin: el tungsteno o wolframio (W) y el molibdeno (Mo), tanto en fases puras como formando compuestos nitrurados. El W es un material de creciente inters tecnolgico, no solamente por sus propiedades superconductoras, sino tambin por se desempeo en reas de reciente investigacin como la espintrnica. Presenta dos fases alotrpicas, siendo solamente de inters tecnolgico la conocida como β-W. En cuanto a sus propiedades superconductoras, no est comprendido de manera correcta en la literatura el papel que juegan las distintas fases de este material y las estructuras desordenadas en el desarrollo de la superconductividad. Esta tesis cumple con tres objetivos en cuanto a las lminas delgadas basadas en W: primero, desarrollar la capacidad de crecer muestras ricas en la fase de inters tecnolgico, β-W. Segundo, comprender el origen de la superconductividad en este material y elucidar el rol que juegan las estructuras desordenadas por sobre las fases cristalinas. Tercero, utilizar el material para fabricar micro-alambres por tcnicas de litografa, que permitan caracterizarlo en vista de su utilizacin en aplicaciones. Por otra parte, los compuestos superconductores basados en nitruros de Mo, han sido caracterizados previamente en la literatura en cuanto a su composicin y propiedades superconductoras. El principal objetivo de esta tesis para con este material es estudiar su comportamiento ante la presencia de interfases e impurezas, en vista de utilizarlo en aplicaciones. Utilizando el conocimiento adquirido, se confinaron estructuras micro-fabricadas geomtricamente, y se evalu el desempeo de la fase superconductora γ-Mo_2N para ser utilizada en la fabricacin de detectores criognicos de radiacin. Adems, en vista de la calidad de las interfases y de las muestras depositadas, se disearon y fabricaron junturas verticales sobre heteroestructuras superconductor/aislante caracterizadas previamente desde un punto de vista bsico. Los resultados proveen un mtodo sencillo y eficiente para depositar lminas delgadas ricas en la fase β-W nanocristalina y un mtodo de depsito de lminas delgadas de la fase γ-Mo_2N con sus propiedades superconductoras optimizadas en lminas delgadas de pocos nanmetros de espesor. Por otra parte, la caracterizacin aplicada muestra que estos materiales son candidatos ejemplares para su utilizacin en el desarrollo de detectores de radiacin, pero no as para el desarrollo de junturas con las heteroestructuras utilizadas.
Resumen en ingls
This thesis refers to the fabrication and characterization of disordered superconducting thin films for their application in electronic devices such as superconducting nanowire single-photon detectors and Josephson junctions. The work is mainly focused in two materials: tungsten (W) and molybdenum (W), both as metallic and nitrides compounds. W is a material of growing technological interest, not only for its superconducting properties, but also for its performance in areas of recent research such as spintronics. It presents two allotropic phases, with only the one known as β-W being of technological interest. Regarding its superconducting properties, the role played by the different phases of this material and the disordered structures in the development of superconductivity is not correctly understood in the literature. This thesis meets three objectives regarding W-based thin films: first, develop the ability to grow samples rich in the phase of technological interest, β-W. Second, understand the origin of superconductivity in this material and elucidate the role played by disordered structures over crystalline phases. Third, use the material to manufacture micro-wires using lithography techniques, which allow it to be characterized in view of its use in applications. On the other hand, superconducting compounds based on Mo nitrides are characterized in terms of their composition and superconducting properties. The main objective of this thesis for this material is to study its behavior in the presence of interfaces and impurities, in view of using it in applications. Using the knowledge acquired, micro-fabricated structures were geometrically confined as much as possible, and the performance of the γ-Mo_2N superconducting phase was evaluated to be used in the fabrication of cryogenic radiation detectors. Furthermore, in view of the quality of the interfaces and the deposited samples, vertical junctions were designed and manufactured on superconducting/insulating heterostructures previously characterized from a basic point of view. The results provide a simple and efficient method to deposit thin films rich in the nanocrystalline β-W phase and a method of deposition for γ-Mo_2N phase in very thin films, which optimizes its superconducting properties even for a few nanometers thick. The applied characterization shows that these materials are exemplary candidates for their use in the development of radiation detectors, but not for the development of vertical junctions with the heterostructures here developed.
| Tipo de objeto: | Tesis (Tesis Doctoral en Fsica) |
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| Palabras Clave: | Superconductivity; Superconductividad; Thin films; Capas delgadas; Nitrides; Nitruros; Junctions; Uniones; [Disordered; Desordenados; Detectors; Detectores] |
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| Materias: | Fsica > Materia condensada Fsica |
| Divisiones: | Gcia. de rea de Investigacin y aplicaciones no nucleares > Gcia. de Fsica > Materia condensada > Bajas temperaturas |
| Cdigo ID: | 1227 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 14 Mar 2024 15:07 |
| ltima Modificacin: | 14 Mar 2024 15:07 |
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