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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 | 徐靖鈞 | zh_TW |
| dc.contributor.author | Ching-Chun Hsu | en |
| dc.date.accessioned | 2026-02-11T16:40:58Z | - |
| dc.date.available | 2026-02-12 | - |
| dc.date.copyright | 2026-02-11 | - |
| dc.date.issued | 2026 | - |
| dc.date.submitted | 2026-02-04 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/101601 | - |
| dc.description.abstract | 本研究以射頻磁控濺鍍製備釔鋇銅氧(YBa2Cu3O7₋δ, YBCO)單層薄膜與鎳酸鑭/釔鋇銅氧(LaNiO3/YBa2Cu3O7₋δ, LNO/YBCO)雙層薄膜。基板選用鈦酸鍶(SrTiO3, STO) (111)，並以YBCO作為底層建立異質結構。製備完成後，以X光繞射儀(XRD)與超導量子干涉儀(SQUID)進行結構與超導性質分析。
XRD 量測結果顯示，YBCO與LNO/YBCO薄膜皆可成功成長於STO (111) 基板上，且由繞射峰位置推得之YBCO (113) 面間距與文獻中塊材及生長於STO (100) 基板之YBCO薄膜存在差異，顯示薄膜之晶格參數可能受到成長條件或氧含量分佈之影響。儘管結構參數呈現差異，SQUID 量測仍確認所有樣品皆具有明確之超導轉變行為。 磁性量測結果顯示，所有樣品之Tc雖低於生長於STO (100) 基板之YBCO薄膜，但仍呈現清楚且穩定之超導轉變特徵。相較於過往STO (100) 基板上的樣品，本研究樣品之Hc1 (0)與Hc2 (0)皆隨Tc的降低而呈現一致性的下降趨勢。此外，由 M-H磁滯回線所推得之臨界電流密度Jc、釘扎力Fp的數量級顯示出與傳統YBCO薄膜不同的趨勢特徵。 在電性量測方面，雖然電性與磁性量測所得之絕對值存在差異，但整體樣品之變化趨勢高度一致。在Hc2-T/Tc關係中，STO (111) 基板上之樣品呈現與STO (100) 基板之YBCO薄膜不同的行為。此外，由ρ-T資料所萃取之釘扎能U/kB顯示，STO (111) 基板上樣品之U/kB相較於STO (100) 基板之樣品為低，且U/kB隨外加磁場增加而呈現近似線性下降的行為。此結果可由二維超導系統中之渦旋–反渦旋對解離機制加以理解，並可透過 Berezinskii–Kosterlitz–Thouless(BKT)特徵分析輔助判斷。 | zh_TW |
| dc.description.abstract | In this study, YBa2Cu3O7₋δ (YBCO) single-layer thin films and LaNiO3/YBa2Cu3O7₋δ (LNO/YBCO) bilayer thin films were fabricated by sputtering on SrTiO3 (STO) (111) substrates, with YBCO serving as the bottom layer. Structural and superconducting properties were characterized using X-ray diffraction (XRD) and Superconducting QUantum Interference Device (SQUID) measurements.
XRD results confirm that both YBCO and LNO/YBCO films were successfully grown on STO (111). The interplanar spacing of the YBCO (113) orientation differs from that of bulk YBCO and YBCO films grown on STO (100), suggesting the influence of growth conditions or oxygen distribution. Despite these structural differences, all samples exhibit clear superconducting transitions. Magnetic measurements show that although the superconducting transition temperatures Tc are lower, stable superconducting behavior is maintained. The Hc1 (0) and Hc2 (0), decrease systematically with decreasing Tc, while the critical current density Jc and Fpexhibits behavior distinct from conventional YBCO thin films. Electrical transport measurements based on resistivity–temperature curves reveal consistent trends. In the Hc2-T/Tc, samples grown on STO (111) exhibit a scaling behavior distinct from that of YBCO thin films grown on STO (100). The activation energy U/kB is smaller for samples on STO (111) and decreases approximately linearly with magnetic field, consistent with quasi-two-dimensional vortex dynamics supported by Berezinskii–Kosterlitz–Thouless (BKT) analysis. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2026-02-11T16:40:58Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2026-02-11T16:40:58Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 摘要 i
Abstract ii 目次 iii 圖次 vi 表次 xi 第一章 緒論 1 1.1拓樸超導體(Topological Superconductor, TSC) 1 1.2釔鋇銅氧(YBa2Cu3O7-δ, YBCO)簡介 2 1.3鎳酸鑭(LaNiO3)簡介 3 1.4 YBCO與LNO薄膜文獻回顧 5 1.5鄰進效應(Proximity Effect)簡介 6 1.6研究動機 7 第二章 理論背景與原理簡介 8 2.1超導體發展史與背景 8 2.2超導體特性 9 2.2.1零電阻(Zero Resistence)與臨界溫度(Critical Temperature, Tc) 9 2.2.2邁斯納效應(Meissner Effect)與臨界磁場(critical magnetic field) 10 2.2.3臨界電流(Critical Current) 11 2.2.4第一類超導體(Type I)與第二類超導體(Type II) 12 2.2.5順磁邁斯納效應(Paramagnetic Meissner Effect, PME) 13 2.3 超導體原理 14 2.3.1倫敦穿透深度(London penetration depth)與二流體模型(two-fluid model) 14 2.3.2相干長度(Coherence Length) 17 2.3.3磁冷(Field Cooling, FC)與零磁冷(Zero Field Cooling, ZFC) 18 2.3.4磁渦旋態(Vortex State) 19 2.3.5表面超導(Surface Superconductivity, Hc3) 20 2.3.6比恩模型(Bean’s Model) 21 2.3.7 Berezinskii–Kosterlitz–Thouless (BKT)相變 22 2.2.8 Anderson-Kim磁通蠕動模型(Anderson-Kim Flux Creep Model) 23 第三章 實驗方法 26 3.1研究流程 26 3.2 YBCO與LNO濺鍍靶材製作 27 3.2.1 YBCO靶材製備 27 3.2.2 LNO靶材製備 28 3.3基板選擇以及清洗 30 3.4射頻磁控濺鍍系統 (RF magnetron sputtering system) 31 3.5薄膜製備流程 33 3.6量測系統 34 3.6.1四點量測系統 34 3.6.2 X光繞射儀(X-ray Diffractometer, XRD) 35 3.6.3原子力顯微鏡(Atomic Force Microscope, AFM) 36 3.6.4超導量子干涉儀(SQUID)量測系統 37 第四章 實驗結果與討論 40 4.1樣品結構與分析 40 4.1.1 XRD量測之晶格常數與結構探討 40 4.1.2 STO (111) 基板上的YBCO Tc對氧含量與其結構關係探討 44 4.2 YBCO單層薄膜與LNO/YBCO雙層薄膜磁性量測結果與討論 48 4.2.1磁化強度(M)與溫度(T)關係 48 4.2.2磁化強度(M)與外加磁場(H)關係 51 4.2.3下臨界磁場(Hc1)與上臨界磁場(Hc2) 52 4.2.4相干長度(Coherence Lengh, ξ)與倫敦穿透深度(London Penetration Depth, λ) 57 4.2.5磁滯曲線(M-H Loop)與臨界電流密度(Critical Current Density, Jc) 60 4.2.6釘扎力(Pinning Force, Fp) 62 4.3 YBCO單層薄膜與LNO/YBCO雙層薄膜電性量測結果與討論 65 4.3.1電阻率(ρ)與溫度(T)關係 65 4.3.2由電性量測之釘扎能(Pinning Energy) 67 4.3.3由電性量測之上臨界磁場(Hc2)與相干長度(ξ) 71 4.3.4 BKT相變 76 第五章 結論 79 參考文獻 80 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 釔鋇銅氧 | - |
| dc.subject | 鎳酸鑭 | - |
| dc.subject | 鈦酸鍶(111) | - |
| dc.subject | 高溫超導體 | - |
| dc.subject | 拓樸超導體 | - |
| dc.subject | YBCO | - |
| dc.subject | LNO | - |
| dc.subject | SrTiO3 (111) | - |
| dc.subject | High-temperature superconductor | - |
| dc.subject | Topological superconductor | - |
| dc.title | 釔鋇銅氧/鎳酸鑭雙層薄膜於鈦酸鍶(111)基板上之超導特性研究 | zh_TW |
| dc.title | Superconducting Properties of YBa2Cu3O7-δ/LaNiO3 Bilayer Thin Films on SrTiO3 (111) Substrates | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 114-1 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 陳昭翰;尤孝雯;林晉緯 | zh_TW |
| dc.contributor.oralexamcommittee | Chao-Han Chen;Hsiao-Wen Yu;Chin-Wei Lin | en |
| dc.subject.keyword | 釔鋇銅氧,鎳酸鑭鈦酸鍶(111)高溫超導體拓樸超導體 | zh_TW |
| dc.subject.keyword | YBCO,LNOSrTiO3 (111)High-temperature superconductorTopological superconductor | en |
| dc.relation.page | 82 | - |
| dc.identifier.doi | 10.6342/NTU202600519 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2026-02-06 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 應用物理研究所 | - |
| dc.date.embargo-lift | N/A | - |
| 顯示於系所單位： | 應用物理研究所 | |
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