Lai, Kwing To = 鐵基超導體的合成與分析 : 氟及釔合摻SmFeAsO / 黎烱韜. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references. / Abstracts in English and Chinese. / Lai, Kwing To = Tie ji chao dao ti de he cheng yu fen xi : fu ji yi he shan SmFeAsO / Li Jiongtao. / Abstract --- p.i / 摘要 --- p.iii / Acknowledgements --- p.v / Table of contents --- p.vii / List of table captions --- p.x / List of figure captions --- p.xi / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Superconductivity --- p.1 / Chapter 1.1.1 --- Physical properties --- p.3 / Chapter 1.1.1.1 --- Zero resistance --- p.3 / Chapter 1.1.1.2 --- Meissner effect --- p.4 / Chapter 1.1.1.3 --- Josephson effect --- p.5 / Chapter 1.1.2 --- Type I and II superconductivity --- p.7 / Chapter 1.2 --- Iron-based superconductors --- p.7 / Chapter 1.2.1 --- Classifications and structures --- p.8 / Chapter 1.2.2 --- Physical properties --- p.12 / Chapter 1.2.3 --- Iron-based superconductors versus Cuprate superconductors --- p.13 / Chapter 1.2.4 --- Correlation between high-Tc superconductivity and magnetism --- p.14 / Chapter 1.2.5 --- Quantum phase transition by doping --- p.16 / Chapter 1.2.6 --- Sample preparation of undoped and doped iron-based superconductors --- p.17 / Chapter 1.3 --- Objectives of this research project --- p.18 / References --- p.20 / Chapter Chapter 2 --- Literature Review --- p.22 / Chapter 2.1 --- Theories of superconductivity --- p.22 / Chapter 2.1.1 --- London equation --- p.22 / Chapter 2.1.2 --- Ginzburg-Landau theory --- p.24 / Chapter 2.1.2.1 --- Mean-field theory and Landau theory --- p.24 / Chapter 2.1.2.2 --- Spatial varying order parameter and Gauge symmetry --- p.27 / Chapter 2.1.2.3 --- Applications --- p.31 / Chapter 2.1.3 --- BCS theory --- p.35 / Chapter 2.2 --- Magnetism in condensed matters --- p.39 / Chapter 2.2.1 --- Ferromagnetism and Antiferromagnetism from local moments --- p.40 / Chapter 2.2.1.1 --- Mathematical explanation in the mean-field approach --- p.40 / Chapter 2.2.1.2 --- Exchange interaction --- p.43 / Chapter 2.2.2 --- Antiferromagnetism in magnetic metals: Spin density wave --- p.45 / References --- p.52 / Chapter Chapter 3 --- Methodology and Instrumentation --- p.53 / Chapter 3.1 --- Sample preparation --- p.53 / Chapter 3.2 --- Characterization --- p.55 / Chapter 3.2.1 --- Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX) --- p.55 / Chapter 3.2.2 --- Transmission electron microscopy (TEM) and Electron diffraction --- p.55 / Chapter 3.2.3 --- X-ray diffraction (XRD) --- p.56 / Chapter 3.2.4 --- X-ray photoelectron spectroscopy (XPS) --- p.57 / Chapter 3.2.5 --- Physical properties measuring system (PPMS) --- p.58 / Chapter 3.2.5.1 --- Transport properties --- p.58 / Chapter 3.2.5.2 --- Magnetic properties --- p.60 / Chapter 3.2.6 --- Raman spectroscopy --- p.62 / Chapter 3.3 --- Precautions --- p.62 / References --- p.63 / Chapter Chapter 4 --- Results --- p.64 / Chapter 4.1 --- Fluorine-doped SmFeAsO --- p.64 / Chapter 4.1.1 --- Morphologies and microstructures --- p.67 / Chapter 4.1.2 --- Phase and composition --- p.69 / Chapter 4.1.3 --- Lattice constants --- p.72 / Chapter 4.1.4 --- Transport properties --- p.73 / Chapter 4.1.5 --- Magnetic properties --- p.74 / Chapter 4.2 --- Fluorine and Yttrium co-doped SmFeAsO --- p.78 / Chapter 4.2.1 --- Morphologies and microstructures --- p.79 / Chapter 4.2.2 --- Phase and composition --- p.82 / Chapter 4.2.3 --- Lattice constants --- p.84 / Chapter 4.2.4 --- Oxidation state --- p.85 / Chapter 4.2.5 --- Transport properties --- p.88 / Chapter 4.2.6 --- Magnetic properties --- p.89 / Chapter 4.3 --- Quality control of the superconducting products --- p.94 / Chapter 4.3.1 --- Intermediate product SmAs --- p.95 / Chapter 4.3.2 --- Intermediate product FeAs --- p.104 / Chapter 4.3.3 --- Effects of annealing temperature --- p.110 / Chapter 4.4 --- Summary --- p.112 / References --- p.112 / Chapter Chapter 5 --- Discussions --- p.113 / Chapter 5.1 --- Effects of F doping --- p.113 / Chapter 5.2 --- Effects of YF doping --- p.115 / Chapter 5.3 --- Improvements in the quality of the superconducting samples --- p.117 / Chapter 5.4 --- Summary --- p.124 / References --- p.125 / Chapter Chapter 6 --- Conclusions and Suggestions for Future work --- p.126 / Chapter 6.1 --- Conclusions --- p.'126 / Chapter 6.2 --- Suggestions for future work --- p.128 / References --- p.130 / Chapter Appendix A --- Sealing samples in small evacuated silica capsules for DTA measurements --- p.131 / Chapter Appendix B --- AC susceptibility measurement --- p.133 / Chapter Appendix C --- Suggested readings for beginners --- p.135 / Bibliography --- p.138
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_327470 |
| Date | January 2011 |
| Contributors | Lai, Kwing To., Chinese University of Hong Kong Graduate School. Division of Physics. |
| Source Sets | The Chinese University of Hong Kong |
| Language | English, Chinese |
| Detected Language | English |
| Type | Text, bibliography |
| Format | print, xv, 139 leaves : ill. ; 30 cm. |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
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