TcSUH
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Special Seminar
Superconducting Systems after Maxwell’s Equations
by: Dr. Bruce Strauss
Date: Tuesday October 25, 2011
Time: 12:00 pm – 1:00 pm
Location: Houston Science Center – Building 593 — Room 102
Overview
Solving Maxwell’s Equations for a superconducting device is just the beginning. Engineering considerations of coil packages including insulation, stability, fields and forces will be discussed. Lessons learned in 50 years of superconducting coil design and construction will be covered.
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Special Seminar
Discovery of a New Magnetic Mode in YBa2Cu3O6.6
by: Prof. H. A. Mook
Date: Friday September 23, 2011
Time: 12:00 pm – 1:00 pm
Location: Houston Science Center – Building 593 — Room 102
Overview
Discovery of a New Magnetic Mode in YBa2Cu3O6.6
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Special Seminar
Crystal Growth of REBCO High Temperature Superconductor by Top-Seeded Solution-Growth (TSSG), Top-Seeded Melt-Growth (TSMG), and Liquid Phase Epitaxy (LPE)
by: Prof. Xin Yao
Date: Tuesday August 30, 2011
Time: 12:00 pm – 1:00 pm
Location: Houston Science Center – Building 593 — Room 102
Overview
For fundamental study and practical application, the crystal growth of REBCO (RE=Nd, Sm, Gd, Y) high temperature superconductors has been investigated in our crystal growth lab. The progress is reviewed on three aspects. 1) Single crystal of REBCO with large size, stoichiometry chemical composition control and excellent superconducting properties by Top-Seeded Solution-Growth (TSSG);2) Novel seeds and phase relation study on the growth of REBCO single domain bulk with the large size and high performance by Top-Seeded Melt-Growth (TSMG); 3) Orientation transition (out of plane, in-plane alignment), its mechanism and film properties by Liquid Phase Epitaxy (LPE). The phase formation and growth mode in various RE-Ba-Cu-O systems are discussed.
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Special Seminar
Magneto-Optics of Dirac Fermions in Graphite
by: Dr. Milan Orlita
Date: Tuesday August 02, 2011
Time: 4:00 pm – 5:00 pm
Location: Houston Science Center – Building 593 — Room 102
Overview
Results of magneto-spectroscopic investigations of Dirac-like electronic states in various graphene-based materials, such as multilayer epitaxial graphene, bulk graphite or decoupled graphene flakes on graphite substrates, will be reported. Landau level spectroscopy will be shown to be a suitable method to study the electronic band structure of these systems as well as to evaluate their electronic quality in terms of the carrier mobility or scattering time.
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Special Seminar
How Superconductors Became Practical: A Walk Through the History and Science of Flux Pinning
by: Prof. Herbert C. Freyhardt
Date: Monday June 20, 2011
Time: 11:30 am – 1:00 pm
Location: Houston Science Center – Building 593 — Room 102
Overview
Since the investigation of flux pinning in superconductors in the early sixties, a considerable amount of work has been accumulated in this field to understand the underlying principles of fundamental interaction mechanisms of flux lines with pinning defects as well as the summation problem for a well characterized arrangement of flux lines. Pinning is and remains one of the essential problems to tailor and optimize the current carrying capability of practical low-Tc or MgB2 superconductors and to make them viable for application. For high-temperature superconductors it is even more challenging because now one has to deal with highly anisotropic superconductors with complex flux and flux line structures which strongly govern the essential irreversibility fields and with a pinning landscape which can be tailored to a large extent to improve engineering critical currents. The challenge is to understand the mechanisms which govern current limitation and to further increase flux pinning and critical current densities in the presently known HTS materials at the operating fields and temperatures, e.g. for devices in electrical and power engineering, to pave the way for a widespread application.
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