Publication: Dinámica de vórtices superconductores en potenciales variables
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Publication Date
2020-11-11
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Gómez Gutiérrez, Alicia
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Universidad Complutense de Madrid
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Abstract
Esta tesis estudia los cambios en la dinámica de los vórtices superconductores cuando estos interaccionan con potenciales artificiales que pueden ser modificados mediante parámetros externos como el campo magnético aplicado o variaciones en la temperatura del sistema. Estos potenciales, introducidos en el superconductor mediante nanoestructuras fabricadas con diversos materiales magnéticos o superconductores, modifican la dinámica de vórtices de una forma u otra en función del estado en el que se encuentren. Debido a las propiedades de los materiales con los que están fabricadas las nanoestructuras que generan estos potenciales, es posible llevar al potencial del estado inicial (as – grown) a otro estado distinto y luego volver al estado inicial. Cada uno de estos estados influye de forma característica en la dinámica de vórtices, siendo posible diferenciarlos mediante medidas de magnetotransporte. Se han estudiado tres tipos de sistemas híbridos, los cuales consisten en películas delgadas superconductoras depositadas sobre las nanoestructuras que generan los potenciales modificables en los que se mueven los vórtices superconductores
This thesis is dedicated to study the changes in the superconducting vortex dynamics in artificial potentials that can be modified by certain external parameters such as the magnetic field or the temperature. These potentials, introduced in the superconductor by artificial nanostructures, modify the vortex dynamics in a way that depends on the state in which they are set. Due to the properties of the materials of which the nanostructures are fabricated, it is possible to bring the potential from the initial state to a different one and then return it to the initial state. Each of these states has a characteristic influence on the superconducting vortex dynamics, being possible to differentiate them by means of magnetotransport measures. Three types of hybrid systems have been studied, consisting of superconducting thin films deposited on top of the nanostructures that generate the variable potentials in which superconducting vortices move...
This thesis is dedicated to study the changes in the superconducting vortex dynamics in artificial potentials that can be modified by certain external parameters such as the magnetic field or the temperature. These potentials, introduced in the superconductor by artificial nanostructures, modify the vortex dynamics in a way that depends on the state in which they are set. Due to the properties of the materials of which the nanostructures are fabricated, it is possible to bring the potential from the initial state to a different one and then return it to the initial state. Each of these states has a characteristic influence on the superconducting vortex dynamics, being possible to differentiate them by means of magnetotransport measures. Three types of hybrid systems have been studied, consisting of superconducting thin films deposited on top of the nanostructures that generate the variable potentials in which superconducting vortices move...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Departamento de Física de Materiales, leída el 18-12-2019