Dynamics of Josephson Junctions in a Superconducting Ring Using a "three-coils" Technique PDF Download
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Author: Oscar Jesús Cubero García
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Author: Oscar Jesús Cubero García
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Author:
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ISBN:
Category :
Languages : en
Pages :
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The aim of this thesis is to observe the Berezinskii-Kosterlitz-Thouless (BKT) transition on a magnetically shielded array of Josephson Junctions using an inductive technique. A major component of this work was the design, fabrication and investigation of the dynamics of a Superconductor-Normal-Superconductor (SNS) Josephson junction embedded in a coplanar and gradiometric superconducting coil. The fabrication process involved a series of steps combining different thin film techniques, such as, photolithography, sputtering, Plasma Enhanced Chemical Vapor Deposition (PECVD) and Reactive Ion Etching (RIE). Furthermore, to extract physical magnitudes, namely the sample coil current, we carried out exact calculations of the self and mutual inductances between the coils of the measurement system. In order to understand the response of our device we started with a lumped circuit model consisting of a Josephson junction in series with a superconducting ring of self inductance L. This model leads to a useful graphical representation which explains qualitatively the principal features of the DC and AC measurements. In particular, it has been demonstrated that the source of the observed dissipation in the AC measurements is a series of jumps in the total flux and a series of hysteresis cycles that the sample undergoes when subjected to an alternating magnetic field. A lumped circuit model that also takes into account the normal resistance of the junction, and then the dissipation, has been implemented. The numerical solution of the corresponding differential equation is in very good quantitative agreement with the AC measurements. On the other hand, it was possible, for the first time with a contactless technique, to extract the critical current of a Josephson junction. Two principal features were observed using the device consisting of a single Josephson junction embedded in a superconducting ring. Firstly, a sudden fall in the critical current near the temperature at which.
Author: Edward L. Wolf
Publisher: CRC Press
ISBN: 9814745480
Category : Science
Languages : en
Pages : 411
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This book summarizes the history and present status and applications of Josephson junctions. These devices are leading elements in superconducting electronics and provide state-of-the-art performance in detection of small magnetic fields and currents, in several digital computing methods, and in medical diagnostic devices and now provide voltage standards used worldwide. Astronomical infrared (IR) telescopes, including the South Pole Telescope, use these junctions in combinations called superconducting quantum interference devices (SQUIDs).
Author: Wissam Abdo Al-Saidi
Publisher:
ISBN:
Category : High temperature superconductors
Languages : en
Pages :
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Abstract: Small Josephson junctions are fascinating quantum systems with numerous potential applications, especially in the still infant field of quantum computation. In the first part of the thesis, I have studied some of the quantum aspects of these systems. Specifically, I have investigated their interactions with a resonant cavity, the Berry phase of a superconducting nanocircuit, and some properties of small Josephson junction arrays. I found that at specific values of the gate voltage of a Cooper pair box, there will be a strong coupling between the Josephson junction and the cavity mode; in this case the junction behaves as a two level atom. I also, verified that if there are N identical junctions in the cavity and are tuned on resonance, the cavity-junction interaction is enhanced by a factor [square root sign]N. This behavior is a clear sign of a cooperative phenomena. Also I found that if a Josephson junction is on resonance with one of the modes of a two-mode cavity, there will be a coupling between the two modes and ultimately a frequency-up or down conversion. I have also studied the spin-wave-like excitations of a disordered two and three dimensional array of small Josephson junctions. I consider a simple form of diagonal disorder and solve for the spin-wave spectral functions using the coherent potential approximation. Finally, using quantum Monte Carlo techniques, I have constructed the phase diagram of a disordered two dimensional array of small Josephson junctions. In the second part of the thesis, I have studied the dynamics of vortices in a clean layered high-temperature superconductor. I found that the c-axis conductivity at nonzero frequencies shows a strong but not divergent increase as the vortex lattice freezing temperature is approached from above, followed by an apparently discontinuous drop. The discontinuity is consistent with the occurrence of a first-order freezing of the vortex lattice. The calculated equilibrium properties agree with previous Monte Carlo studies of the system.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 654
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Category : Aeronautics
Languages : en
Pages : 994
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Category : Nuclear energy
Languages : en
Pages : 1118
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Author: Alexey V. Ustinov
Publisher: Wiley-VCH
ISBN: 9783527404599
Category : Science
Languages : en
Pages : 400
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Vortices in superconducting tunnel junctions are magnetic flux quanta which propagate with relativistic velocities and have characteristic properties of solitons. The book is starting from a very basic introduction into both physics of superconductors and modeling of solitons and moving on to a more advanced review of the state-of-the-art of the field in the final chapters. It will be of interest both to people who are new to studies of vortex dynamics in Josephson junctions and to those who are already familiar with this fascinating area of research. This field puts together solid state physics, electromagnetism and nonlinear dynamics of waves. The author, who is himself an experimentalist, concentrates on experimental and physical aspects rather than on mathematical theory of solitons. While the introduction focuses on the Josephson effect along with the modeling of solitons in Josephson systems, the main part of the book deals with topics such as the observation methods for Josephson solitons, different regimes of vortex motion, various geometries of junctions and arrays of them. Most recent and advanced topics as quantum dynamics of Josephson vortices, stacks, and applications of solitons oscillators are discussed at the final part of the book.
Author: United States. Energy Research and Development Administration
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1320
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Author:
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ISBN:
Category :
Languages : en
Pages : 724
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