請用此 Handle URI 來引用此文件：
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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王立民 | zh_TW |
| dc.contributor.advisor | Li-Min Wang | en |
| dc.contributor.author | 黃冠銓 | zh_TW |
| dc.contributor.author | Kuan-Chuan Huang | en |
| dc.date.accessioned | 2025-04-02T16:15:30Z | - |
| dc.date.available | 2025-04-03 | - |
| dc.date.copyright | 2025-04-02 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-02-23 | - |
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V. Feigel’man, V. B. Geshkenbein, A. I. Larkin, and V. M. Vinokur (1989). Theory of collective flux creep. Phys. Rev. Lett. 63, 2303. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97277 | - |
| dc.description.abstract | 本研究主要探討了拓撲絕緣體Sb2Te3以及金屬Au與二維材料NbSe2形成的異質結構的超導特性。實驗由台科大透過化學氣相傳輸（CVT）方法生長出的NbSe2單晶，經過加壓退火處理後，將20 nm的Sb2Te3和Au分別鍍在NbSe2上，形成不同的異質結構。這些結構的電子性質通過電阻率測量和磁阻實驗進行了詳細的分析。研究發現，Sb2Te3/NbSe2顯示了明顯的超導轉變，而Au/NbSe2則作為參考系統展示了與Sb2Te3/NbSe2相比較的性質。此外，我們觀察了Sb2Te3/NbSe2結構中的釘扎效應和BKT相變行為，這些發現對於理解異質結構中的超導機制和超導態的微觀物理行為具有重要意義。
從電阻率對溫度的測量我們發現Sb2Te3/NbSe2的Tc為7.04 K略高於Au/NbSe2的6.88 K，前者平行於樣品表面的磁場的上臨界溫度Hc2為14.73 T則是高於後者的9.11 T，表示著典型的導體可能有著破壞Ising 超導的效果，而垂直於樣品表面的磁場的Hc2前者則大幅上升至8.88 T，後者則小幅的下降至5.75 T，使得兩樣品的各向異性都大幅下降。接下來利用V-H圖分析釘扎力，發現前者的釘扎力在兩個方向上都比較大，意味著能夠承受更多的臨界電流。再來由V-I圖的斜率得到α與溫度的關係，以此來得出BKT相變溫度TBKT，也比較了加磁場前後的差別，觀察到兩個樣品的TBKT均有下降，證明了其二維的性質。最後利用從小電流量測出磁場平行表面的Hc3再與理論值的Hc3 = 1.695 Hc2做對比，可以發現典型的金屬鍍層會使表面超導存在的空間更大。 | zh_TW |
| dc.description.abstract | This study primarily investigates the superconducting properties of heterostructures formed by the topological insulator Sb₂Te₃ and the metal Au with the two-dimensional material NbSe₂. The NbSe₂ single crystals were grown at NTUST using the chemical vapor transport (CVT) method, and after annealing under pressure, Sb₂Te₃ and Au were respectively deposited on NbSe₂ to form different heterostructures. The electronic properties of these structures were thoroughly analyzed through resistivity measurements, and magnetoresistance experiments. The study found that Sb₂Te₃/NbSe₂ exhibited a significant superconducting transition, while Au/NbSe₂ served as a reference system, showing comparative properties to Sb₂Te₃/NbSe₂. Additionally, we observed pinning effects and BKT transition behavior in the Sb₂Te₃/NbSe₂ structure, which are crucial for understanding the superconducting mechanisms and microscopic physical behavior in heterostructures.
From the resistivity vs. temperature measurements, we found that the critical temperature (Tc) of Sb₂Te₃/NbSe₂ is 7.04 K, slightly higher than the 6.88 K of Au/NbSe₂. The upper critical field (Hc2) parallel to the sample surface for Sb₂Te₃/NbSe₂ is 14.73 T, higher than the 9.11 T for Au/NbSe₂, indicating that typical conductors may have a detrimental effect on Ising superconductivity. When the magnetic field is perpendicular to the sample surface, the Hc2 for Sb₂Te₃/NbSe₂ increases significantly to 8.88 T, whereas for Au/NbSe₂ it slightly decreases to 5.75 T, greatly reducing the anisotropy of both samples. Next, by analyzing the pinning force through V-H plots, we found that the pinning force in Sb₂Te₃/NbSe₂ is larger in both directions, meaning it can withstand higher critical currents. Furthermore, from the slope of the V-I plots, we obtained the relationship between the exponent α and temperature, and thus determined the BKT transition temperature (TBKT). We also compared the differences before and after applying the magnetic field, observing a decrease in TBKT for both samples, confirming their two-dimensional nature. Finally, by measuring the upper critical field Hc3 and comparing it with Hc2 in the direction parallel to the sample surface, we found that the typical metal coating allows for a larger space for surface superconductivity. These findings provide valuable insights into the design and optimization of new quantum materials and devices. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-04-02T16:15:30Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-04-02T16:15:30Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 致謝 ii
摘要 iii Abstract iv 目次 vi 圖次 viii 表次 x 第一章 緒論 1 1-1 超導簡史 1 1-2 Ising 超導 2 1-3 NbSe2 3 1-4 拓撲絕緣體 4 1-5 研究動機 5 第二章 理論背景與原理簡介 7 2-1 超導體特性 7 2-1-1 臨界溫度時的零電阻現象 7 2-1-2 完美抗磁性(Perfect Diamagnetism) 10 2-1-3 倫敦穿透深度(London penetration depth) 12 2-1-4 二流體模型(Two-fluid Model) 14 2-1-5 吉因茨堡-朗道理論（Ginzburg-Landau，簡稱 G-L 理論） 15 2-1-6 I 類和 II 類超導體 17 2-1-8 Anderson-Kim 磁通蠕動模型 21 2-2 朗道-費米液體理論（Landau-Fermi Liquid Theory） 23 2-3 BKT 相變（Berezinskii-Kosterlitz-Thouless 相變） 23 2-4 磁阻 Magnetoresistance (MR) 24 2-5 Kohler's rule 25 第三章 實驗方法 28 3-1 實驗過程 28 3-1-1 實驗流程 28 3-1-2 系統搭建 29 3-1-3 濺鍍原理 31 3-1-4 樣品製程流程 33 3-2 量測系統 34 3-2-1 X光繞射儀(X-ray Diffractometer, XRD) 34 3-2-2 SQUID 量測系統 35 第四章 實驗結果與討論 38 4-1 XRD結果 38 4-2 電阻率、上臨界磁場與釘扎 39 4-2-1 電阻率與溫度變化分析 39 4-2-2 上臨界磁場、相干長度與溫度關係分析 46 4-2-3 釘扎力與磁場關係分析 54 4-3 MR分析 60 4-3 BKT 相變分析 63 4-4 Hc3 分析 67 第五章 結論 70 Reference 72 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | NbSe₂ | zh_TW |
| dc.subject | Hc3 | zh_TW |
| dc.subject | BKT相變 | zh_TW |
| dc.subject | 釘扎效應 | zh_TW |
| dc.subject | 二維材料 | zh_TW |
| dc.subject | 第二類超導 | zh_TW |
| dc.subject | 拓撲超導體 | zh_TW |
| dc.subject | Sb₂Te₃ | zh_TW |
| dc.subject | Ising 超導 | zh_TW |
| dc.subject | Ising superconductivity | en |
| dc.subject | pinning effect | en |
| dc.subject | type-II superconductors | en |
| dc.subject | two-dimensional materials | en |
| dc.subject | BKT transition | en |
| dc.subject | Hc3 | en |
| dc.subject | topological superconductors | en |
| dc.subject | Sb₂Te₃ | en |
| dc.subject | NbSe₂ | en |
| dc.title | 三碲化二銻/硒化鈮和金/硒化鈮異質結構的超導性能 | zh_TW |
| dc.title | Superconducting properties of Sb2Te3/NbSe2 and Au/NbSe2 hetrostructures | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 尤孝雯;陳昭翰 | zh_TW |
| dc.contributor.oralexamcommittee | Hsiao-Wen Yu;Jau-Han Chen | en |
| dc.subject.keyword | 二維材料,第二類超導,拓撲超導體,Sb₂Te₃,NbSe₂,Ising 超導,釘扎效應,BKT相變,Hc3, | zh_TW |
| dc.subject.keyword | two-dimensional materials,type-II superconductors,topological superconductors,Sb₂Te₃,NbSe₂,Ising superconductivity,pinning effect,BKT transition,Hc3, | en |
| dc.relation.page | 76 | - |
| dc.identifier.doi | 10.6342/NTU202500733 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2025-02-24 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 應用物理研究所 | - |
| dc.date.embargo-lift | 2025-04-03 | - |
| 顯示於系所單位： | 應用物理研究所 | |
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