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Phase Slips in Isolated Mesoscopic S...
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Lollo, Anthony.
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Phase Slips in Isolated Mesoscopic Superconducting Aluminum Rings.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Phase Slips in Isolated Mesoscopic Superconducting Aluminum Rings./
作者:
Lollo, Anthony.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:
229 p.
附註:
Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
Contained By:
Dissertations Abstracts International80-02B.
標題:
Condensed matter physics. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10927834
ISBN:
9780438194045
Phase Slips in Isolated Mesoscopic Superconducting Aluminum Rings.
Lollo, Anthony.
Phase Slips in Isolated Mesoscopic Superconducting Aluminum Rings.
- Ann Arbor : ProQuest Dissertations & Theses, 2018 - 229 p.
Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
Thesis (Ph.D.)--Yale University, 2018.
This item must not be added to any third party search indexes.
Phase slips result in many interesting properties of superconducting materials, such as the finite resistance of thin superconducting nanowires, the decay of current in superconducting rings, and the flux periodicity of the critical temperature Tc in hollow superconducting cylinders or rings [1, 2]. Though the first experiments were performed in 1961, the goal of observing coherent macroscopic quantum tunneling in uniform superconductors has sparked recent interest in the field. In this dissertation, we present measurements of the supercurrent I in arrays of uniform isolated mesoscopic aluminum rings as a function of applied magnetic field B, measured through cantilever torque magnetometry. These measurements are taken over the full range of applied magnetic fields for which the rings are superconducting and for 400 mK < T < Tc. We fit the I( B) data to Ginzburg-Landau (GL) theory for a 1-dimensional superconducting ring with the inclusion of finite width. This detailed analysis extends the range of both temperature and applied magnetic fields over which prior measurements were quantitatively analyzed. Further, we show that phase slips occur deterministically as the free energy barrier separating two metastable states vanishes. We also present measurements of the distribution of applied magnetic fields at which a phase slip occurs for two individual isolated superconducting rings each of different radius. We find that as temperature is increased the mean and standard deviation decrease, while the skewness is always close to -1 with respect to an applied magnetic field ramp that decreases the free energy barrier. We provide a theoretical review of GL theory relevant to this work and we review key experimental works within the phase slip literature. We describe the cantilever torque magnetometry technique, as well as the details necessary for the inclusion of a small magnetic coil, which allowed us to precisely control the magnetic field we applied to the individual superconducting rings.
ISBN: 9780438194045Subjects--Topical Terms:
3173567
Condensed matter physics.
Phase Slips in Isolated Mesoscopic Superconducting Aluminum Rings.
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Phase slips result in many interesting properties of superconducting materials, such as the finite resistance of thin superconducting nanowires, the decay of current in superconducting rings, and the flux periodicity of the critical temperature Tc in hollow superconducting cylinders or rings [1, 2]. Though the first experiments were performed in 1961, the goal of observing coherent macroscopic quantum tunneling in uniform superconductors has sparked recent interest in the field. In this dissertation, we present measurements of the supercurrent I in arrays of uniform isolated mesoscopic aluminum rings as a function of applied magnetic field B, measured through cantilever torque magnetometry. These measurements are taken over the full range of applied magnetic fields for which the rings are superconducting and for 400 mK < T < Tc. We fit the I( B) data to Ginzburg-Landau (GL) theory for a 1-dimensional superconducting ring with the inclusion of finite width. This detailed analysis extends the range of both temperature and applied magnetic fields over which prior measurements were quantitatively analyzed. Further, we show that phase slips occur deterministically as the free energy barrier separating two metastable states vanishes. We also present measurements of the distribution of applied magnetic fields at which a phase slip occurs for two individual isolated superconducting rings each of different radius. We find that as temperature is increased the mean and standard deviation decrease, while the skewness is always close to -1 with respect to an applied magnetic field ramp that decreases the free energy barrier. We provide a theoretical review of GL theory relevant to this work and we review key experimental works within the phase slip literature. We describe the cantilever torque magnetometry technique, as well as the details necessary for the inclusion of a small magnetic coil, which allowed us to precisely control the magnetic field we applied to the individual superconducting rings.
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