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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王立民 | zh_TW |
| dc.contributor.advisor | Li-Ming Wang | en |
| dc.contributor.author | 徐辰硯 | zh_TW |
| dc.contributor.author | Chen-Yen Hsu | en |
| dc.date.accessioned | 2026-08-19T16:10:18Z | - |
| dc.date.available | 2026-08-20 | - |
| dc.date.copyright | 2026-08-19 | - |
| dc.date.issued | 2026 | - |
| dc.date.submitted | 2026-08-10 17:05:40 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/103708 | - |
| dc.description.abstract | 本論文研究不同堆疊配置之Nb/Sb2Te3多層薄膜的磁通釘札行為與渦旋動力學，並建立一套規範化且具再現性的分析架構，由溫度與磁場相依的磁化量測中取得超導轉變溫度、特徵磁場、臨界電流密度 J_{c} 與釘札力密度 F_{p}。磁性響應呈現多重超導轉變特徵，顯示此多層薄膜無法以單一均勻的超導態描述。透過分析 J_{c}\left(H\right)、F_{p}\left(H\right)、歸一化釘札力與對數 J_{c}\left(H\right)，可辨識出不同的釘札區域與類第二峰值行為，顯示渦旋響應會隨磁場及溫度演變。
最值得注意的是，當磁場平行於 ab 平面時，系統於約3 K呈現異常的低場釘札增強。排除受額外磁性訊號影響的區域後，面外方向並未重現相同的增強現象。此方向差異顯示該異常增強具有異向性，且對多層膜介面敏感，而非僅源自傳統的塊材Nb釘札。儘管僅憑磁性量測尚無法唯一判定其微觀來源，本研究結果仍為進一步探討Nb/Sb2Te3多層薄膜中受介面調控的渦旋動力學提供了實驗基礎。 | zh_TW |
| dc.description.abstract | This thesis investigates flux pinning behavior and vortex dynamics in Nb/Sb2Te3 multilayer thin films with different multilayer configurations. A standardized and reproducible framework was established to extract superconducting transition temperatures, characteristic magnetic fields, critical current density J_{c}, and pinning-force density F_{p} from temperature- and field-dependent magnetization measurements. The magnetic responses exhibit multiple superconducting-transition features, indicating that the multilayer films cannot be described by a single homogeneous superconducting state. Analyses of J_{c}\left(H\right), F_{p}\left(H\right), normalized pinning force, and logarithmic J_{c}\left(H\right) reveal distinct pinning regimes and second-peak-like behavior, demonstrating the evolution of the vortex response with magnetic field and temperature.
Most notably, an anomalous low-field pinning enhancement appears near 3 K when the magnetic field is applied parallel to the ab plane. No comparable enhancement is reproduced in the out-of-plane configuration after excluding regions affected by additional magnetic signals. This directional contrast indicates that the anomalous enhancement is anisotropic and sensitive to the multilayer interfaces, rather than arising solely from conventional bulk Nb pinning. Although its microscopic origin cannot be uniquely determined from magnetic measurements alone, these results provide an experimental basis for investigating interface-modified vortex dynamics in Nb/Sb2Te3 multilayer thin films. | en |
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| dc.description.tableofcontents | PREFACE I
摘要 II ABSTRACT III CONTENTS IV LIST OF FIGURES IX LIST OF TABLES XIII CHAPTER 1 INTRODUCTION 1 1.1 Superconductivity 1 1.1.1 Superconductivity 1 1.1.2 Niobium 3 1.2 Topological Insulator 4 1.2.1 Discovery of Topological Insulators 4 1.2.2 Sb2Te3 5 1.2.3 Topological Superconductor 6 1.3 Research Motivation and Objectives 6 CHAPTER 2 BACKGROUND KNOWLEDGE FOR MAGNETIC ANALYSIS 8 2.1 Magnetic Response of Superconductors 8 2.1.1 Superconducting Transition and Zero Resistance 8 2.1.2 Meissner Effect 9 2.1.3 Critical Magnetic Field 11 2.1.4 Critical Current 12 2.2 Critical Fields in Type-II Superconductors 14 2.2.1 London penetration depth 14 2.2.2 Pippard coherence length 17 2.2.3 Ginzburg–Landau Theory and Type-I/Type-II Classification 21 2.3 Vortex Matter and Irreversible Magnetization 27 2.4 Interpretation of anomalous magnetization-loop morphologies 34 2.4.1 Second Peak Effect 34 2.4.2 Abrupt low-field vortex processes 41 CHAPTER 3 EXPERIMENTAL METHODS AND DATA PROCESSING PROCEDURES 46 3.1 Chapter Overview 46 3.2 Sb2Te3 Bulk Target Preparation 47 3.2.1 Stoichiometric Calculation and Sintering Process 47 3.2.2 EDS and XRD Characterization of Sb2Te3 Bulk Crystal 50 3.2.3 Grinding and Target Compression 53 3.3 Thin Film Deposition 55 3.3.1 Sputtering System Configuration 55 3.3.2 Substrate Cleaning and Chamber Pre-conditioning 58 3.3.3 Thin Film Deposition Parameters 62 3.3.4 Deposition Rate Calibration 65 3.3.5 Multilayer Structure Design 69 3.4 Structural Characterization 71 3.4.1 X-ray Diffraction Measurement 71 3.4.2 Crystallographic Analysis 72 3.5 Definitions and Extraction Criteria of Magnetic Quantities 73 3.5.1 SQUID Output and Magnetization Conversion 73 3.5.2 Superconducting Transition Temperature Determination 74 3.5.3 Background Subtraction Procedure 76 3.5.4 Lower Critical Field Determination 77 3.5.5 Upper Critical Field Determination 79 3.5.6 Irreversibility Field Determination 80 3.6 Automated Data Analysis Workflow 81 3.6.1 Overview of the Analysis Programs 81 3.6.2 Derivative and Local-Slope Processing Module 83 3.6.3 Hc2 Extraction Module 85 3.6.4 Jc, Fp, and Hirr Processing Module 87 3.6.5 Dew-Hughes Fitting Module 93 3.6.6 Output Consistency and Workflow Limitations 96 3.7 Summary of Experimental Workflow 97 CHAPTER 4 MAGNETIC RESPONSE AND VORTEX PINNING BEHAVIOR IN NB/SB2TE3 MULTILAYERS 100 4.1 Analysis strategy and evidence chain 100 4.2 Temperature-dependent magnetization: superconducting transition and anomalous magnetic response 102 4.2.1 Superconducting quality verification of single-layer Nb film 102 4.2.2 M(T) curves of Nb/Sb2Te3 multilayer samples 105 4.3 Field-dependent magnetization from m(H)-curves: characteristic superconducting fields 108 4.3.1 Initial m(H)-curves and field-induced suppression of diamagnetism 108 4.3.2 Determination of Hc1 and Hc2 110 4.3.3 Effective coherence length, penetration depth, and GL parameter 113 4.3.4 Definition of Hg as an empirical diamagnetic maximum field 123 4.3.5 Temperature dependence of Hc1, Hg, and Hc2 126 4.4 Magnetic hysteresis and irreversible vortex response 129 4.4.1 Temperature evolution of m(H)-loops 129 4.4.2 Temperature evolution of Jc(H) 132 4.4.3 Temperature dependence of the zero-field critical current density and Griessen-type pinning analysis 134 4.4.4 Irreversibility field Hirr(T) and extended phase diagram 140 4.5 Pinning force Fp(H) and Field-dependent Pinning Regimes 142 4.5.1 Field dependence of Fp(H) and Normalized pinning force fp(h) 142 4.5.2 Dew-Hughes-type analysis of low-field and high-field regimes 145 4.6 Evidence for competing vortex-pinning regimes 150 4.6.1 Logarithmic analysis of Jc(H) 150 4.6.2 Temperature evolution of HSPE, Hcollapse, hmax,L and hmax,H 153 4.7 Field-orientation dependence of vortex pinning in the 3ML sample 162 CHAPTER 5 CONCLUSION AND FUTURE WORK 171 5.1 Conclusion 171 5.2 Future works 174 REFERENCES 176 | - |
| dc.language.iso | en | - |
| dc.subject | 多層薄膜 | - |
| dc.subject | 拓樸超導體 | - |
| dc.subject | 磁通釘札 | - |
| dc.subject | 渦旋動力學 | - |
| dc.subject | 介面效應 | - |
| dc.subject | Multilayer thin films | - |
| dc.subject | topological superconductor | - |
| dc.subject | flux pinning | - |
| dc.subject | vortex dynamics | - |
| dc.subject | interface effects | - |
| dc.title | Nb/Sb2Te3多層薄膜中磁通釘札行為與渦旋動力學之研究 | zh_TW |
| dc.title | Investigation of Flux Pinning Behavior and Vortex Dynamics in Nb/Sb2Te3 Multilayer Thin Films | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 114-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 尤孝雯;陳昭翰;林晉緯 | zh_TW |
| dc.contributor.oralexamcommittee | Hsiao-Wen Yu;Jau-Han Chen;Chin-Wei Lin | en |
| dc.subject.keyword | 多層薄膜; 拓樸超導體; 磁通釘札; 渦旋動力學; 介面效應 | zh_TW |
| dc.subject.keyword | Multilayer thin films; topological superconductor; flux pinning; vortex dynamics; interface effects | en |
| dc.relation.page | 183 | - |
| dc.identifier.doi | 10.6342/NTU202603691 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2026-08-13 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 應用物理研究所 | - |
| dc.date.embargo-lift | 2026-08-20 | - |
| 顯示於系所單位： | 應用物理研究所 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-114-2.pdf | 6.12 MB | Adobe PDF | 檢視/開啟 |
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