博碩士論文 106222601 詳細資訊




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姓名 Zainollah(Ahmad)  查詢紙本館藏   畢業系所 物理學系
論文名稱 Sn納米粒子的超導電性和自旋極化
(Superconductivity and Spin Polarization in Sn Nanoparticles)
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摘要(中) 通過具有單源室的熱蒸發方法製造Sn納米顆粒。 進行X射線衍射,利用晶體結構的表徵來確定生長的Sn納米顆粒的平均粒徑(樣品1和样品2分別為56nm和152nm)。 Sn的組成是使用通用結構分析系統(GSAS)程序分析X射線衍射圖案。
在我們的研究中,通過AC磁化率(χAC=χ′+iχ′′)測量超導抗磁屏蔽效應。 磁化率χ′(T)的溫度依賴性可以用Scalapino的表達式來描述,該表達式允許提取超導轉變溫度。 樣品1和样品2的臨界溫度分別為3.8K和3.6K。
在磁化率χ′(H)曲線的場依賴性中可以看到自旋極化效應,其可以通過衍生Langevin函數來描述,樣品1和样品2都顯示出超導性和自旋極化。
摘要(英) Sn nanoparticles are fabricated by a thermal evaporated method with single source chamber. X-ray diffraction performed the characterization of the crystal structure is utilized to determine the mean particle diameter (sample 1 and sample 2 is 56 nm and 152 nm, respectively) of the Sn nanoparticle as grown. The composition of Sn is an analysis of the X-ray diffraction pattern using the General Structure Analysis System (GSAS) program.
In our study, the superconducting diamagnetic screening effect was measured through AC magnetic susceptibility (χ_AC=χ^′+iχ′′). The temperature dependence of magnetic susceptibility χ′(T) can be described by Scalapino’s expression, which allows extracting the superconducting transition temperature. The critical temperature of sample 1 and sample 2 is 3.8 K and 3.6 K, respectively.
The spin polarization effects are seen in field dependence of the magnetic susceptibility χ′(H) curve, which can be described by derivative Langevin function, both of sample 1 and sample 2 revealing of superconductivity and spin polarization.
關鍵字(中) ★ Sn,X射線衍射,反磁性,自旋極化 關鍵字(英) ★ Sn, X-ray diffraction, diamagnetic, spin polarization
論文目次 摘要 i
ABSTRACT ii
Acknowledgments iii
TABLE OF CONTENT iv
List of Figure vi
List of Tables viii
Chapter 1. Introduction 1
1.1. Physical Properties of Tin 1
1.2. Superconductivity and Meissner 2
1.3. Spin Polarization of Nanoparticles 4
Chapter 2. Experimental 5
2.1. X-Ray Diffraction 5
2.2. Magnetic Measurement 7
Chapter 3. Crystalline Structure Analysis 10
3.1. Sample Fabrication 10
3.2. Sample Characterization 14
3.3. Crystallite Size 19
Chapter 4. Superconductivity of Tin 27
4.1. Temperature Dependence of The Magnetic Susceptibility 27
4.2. Field dependence of the magnetic susceptibility 32
4.3. Means Particle Moment and Hysteresis 41
Chapter 5. Conclusions 45
Reference 46
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指導教授 Wen-Hsien Li 審核日期 2019-7-17
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