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Flux pinning in HT c superconductors Adrian Crisan School of Metallurgy and Materials, University of Birmingham, B15 2TT U.K. The lecture start with a short introduction of the difference between type I and type II superconductors, the characteristic lengths (penetration depth and coherence length), the vortex (mixed) state, flux quanta (vortex), the Lorentz and pinning forces. Several types of natural and artificial pinning centres will be then presented, especially for thin films and coated conductors, with TEM images from nanostructured thin films illustrating various types of defects (pinning centres). The lecture will continue with the estimation of bulk pinning force (from critical current density) from DC magnetization loops. Dew-Hughes model linking the type and dimensionality of pinning centres with the field dependence of normalized pinning force will be explained, with few examples (much more examples will be given in the shorter talk during Workshop). Next it will be described the use of frequency-dependent AC susceptibility measurements to estimate and model the average pinning potential, with few examples from my lab. The lecture will draw a few important conclusions about the importance of pinning centres, their nano-engineering, their properties, in correlation with structural analysis. 20
MINICOURSES Técnicas de síntese de materiais supercondutores cerâmicos e intermetálicos. Prof. Dr. Antonio Jefferson da Silva Machado EEL - USP A qualidade de um material supercondutor está diretamente relacionada com a técnica escolhida para a sua síntese. Neste mini-curso iremos discutir as técnicas que são normalmente empregadas para a produção de materiais policristalinos e monocristais de alta qualidade. O emprego de diagrama de fases termodinâmico, técnicas de crescimento de monocristais pelo método do fluxo, o método Czochraslki de crescimento, produção de materiais policristalinos pela tecnologia do pó e algumas técnicas de crescimento de filmes finos serão discutidos. 21
Page 1: X Brazilian School of Superconducti
Page 4 and 5: Welcome Addresses On behalf of the
Page 6 and 7: Chairs Schedule 09:00 - 10:30 10:30
Page 8 and 9: Tuesday 11th ______________________
Page 10 and 11: Thursday 13th _____________________
Page 12 and 13: POSTER PRESENTATION 01 - Supercondu
Page 14 and 15: 14 - Structural, microstructural, m
Page 16 and 17: 26 - Preparation and characterizati
Page 18 and 19: MINICOURSES 12
Page 20 and 21: Solução numérica das equações
Page 22 and 23: Some remarks on synthesis, structur
Page 24 and 25: Measuring the thermal expansion of
Page 28 and 29: From your laboratory to publishable
Page 30 and 31: Time reversal symmetry breaking and
Page 32 and 33: Limitation of ac electrical current
Page 34 and 35: Multicanonical distribution: applic
Page 36 and 37: Spin current phenomena: new impetus
Page 38 and 39: Stabilizing composite vortex states
Page 40 and 41: Study of the phase formation on YBa
Page 42 and 43: Synthesis and superconducting prope
Page 44 and 45: Superconductivity of a new non-cent
Page 46 and 47: Effect of interface roughness on th
Page 48 and 49: Inter-band interactions between vor
Page 50 and 51: Research possibilities at the NIST
Page 52 and 53: Magnetic and Superconductor propert
Page 54 and 55: Fine tuning of the ground state of
Page 56 and 57: Field induced superconductivity, di
Page 58 and 59: Magnetic cloaking and concentration
Page 60 and 61: Flux fractionalization and flux dyn
Page 62 and 63: Unusual thermoelectric properties o
Page 64 and 65: POSTER CONTRIBUTIONS ABSTRACTS POST
Page 66 and 67: POSTER CONTRIBUTIONS Processing and
Page 68 and 69: POSTER CONTRIBUTIONS London Approxi
Page 70 and 71: POSTER CONTRIBUTIONS Processing and
Page 72 and 73: POSTER CONTRIBUTIONS Superconductiv
Page 74 and 75: POSTER CONTRIBUTIONS Superconductiv
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POSTER CONTRIBUTIONS Dual view of t
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POSTER CONTRIBUTIONS Structural, mi
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POSTER CONTRIBUTIONS Crossover betw
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POSTER CONTRIBUTIONS Magnetic Studi
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POSTER CONTRIBUTIONS Síntese e car
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POSTER CONTRIBUTIONS Polarized Rama
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POSTER CONTRIBUTIONS Hematite sub-m
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POSTER CONTRIBUTIONS Preparation an
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POSTER CONTRIBUTIONS The electrical
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POSTER CONTRIBUTIONS Study of the m
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POSTER CONTRIBUTIONS Possibility of
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Registered Participants Registered
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