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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 梁啟德 | zh_TW |
| dc.contributor.advisor | Chi-Te Liang | en |
| dc.contributor.author | 蕭其峯 | zh_TW |
| dc.contributor.author | Chi-Feng Hsiao | en |
| dc.date.accessioned | 2024-01-28T16:19:24Z | - |
| dc.date.available | 2024-02-24 | - |
| dc.date.copyright | 2024-01-27 | - |
| dc.date.issued | 2023 | - |
| dc.date.submitted | 2023-07-07 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/91510 | - |
| dc.description.abstract | 鉍鍶鈣銅氧（BSCCO）是層狀銅氧化物家族中具有高溫超導潛力的材料之一，其臨界溫度高於液氮溫度（77 K）。本論文專注於最廣泛研究的Bi2Sr2CaCu2O8+x （Bi-2212），我們製備了高品質的Bi-2212樣品，並使用拉曼光譜研究其晶格振動模態。透過在平行和垂直偏振散射下進行晶體取向和偏振解析的測量，以及進行對稱性分析，我們闡明了聲子振動模式的特性。大部分拉曼活性模式可歸因於三斜晶系Ci結構中的Ag對稱性，與通常認定的正交D2h結構有所不同。然而在垂直偏振光譜中，我們觀察到幾個聲子模式呈現異常的對稱性破壞，形成了二重對稱性，這與Ag聲子模態的典型四重對稱性不同，其異常行為歸因於非零的拉曼張量元素和各異向性晶體所引起的光學異向吸收與雙折射效應。論文的第二部分，我們利用拉曼光譜研究了Bi-2212在不同實驗條件下的化學穩定性。拉曼光譜顯示，未老化的Bi-2212樣品在高達500 ℃的熱處理後其振動模式保持不變。然而，老化的樣品在退火過程中易受損，並產生了新的副產物（例如CuO、BiOx）。我們的研究結果為未來基於BSCCO的元件製程提供了有價值的資訊。 | zh_TW |
| dc.description.abstract | Bismuth strontium calcium copper oxide (BSCCO) is one of the promising high-temperature superconductors in the family of layered copper oxides, which exhibit high critical temperature (Tc) above liquid nitrogen temperature (77 K). In this thesis, we focus on the most generally studied family of Bi2Sr2CaCu2O8+x (Bi-2212). We fabricate high-quality, layered Bi-2212 samples and perform Raman spectroscopy to study their lattice vibration modes. By measuring the crystal-orientation- and polarization-resolved spectra in both parallel (HH) and crossed (HV) polarization scattering geometries and performing symmetry analysis, we clarify the characteristics of the phonon vibration modes. In the back-scattering geometry, most of the Raman active modes can be attributed to Ag symmetry in the triclinic Ci structure, in contrast to the commonly assumed orthorhombic D2h structure. Interestingly, in HV scattered spectra, we observe an anomalous symmetry-breaking to a two-fold symmetry from several phonon modes, in contrast to the typically four-fold symmetry of Ag phonons. We attribute this anomalous behavior to the birefringence effect and optical absorption of the anisotropic crystal. In the second part of the thesis, we employ Raman spectroscopy to study the chemical stability of Bi-2212 in various experimental conditions. The Raman spectra show that the vibrational modes of the freshly cleaved Bi-2212 flakes remained unchanged after thermal treatment up to 500 ℃. However, the aged Bi-2212 samples are prone to damage as evidenced by new byproducts (e.g., CuO, BiOx) during thermal annealing. Our results provide valuable information for fabricating BSCCO-based devices in the future. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-01-28T16:19:24Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-01-28T16:19:24Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 #
誌謝 i 中文摘要 ii ABSTRACT iii CONTENTS iv LIST OF FIGURES vii LIST OF TABLES xiv Chapter 1 Introduction 1 1.1 Two-dimensional material 1 1.2 High-temperature superconductors 3 1.3 Bismuth strontium calcium copper oxide 7 1.4 Paper review: Raman studies in BSCCO 12 1.5 Motivation 21 Chapter 2 Theory 22 2.1 Origin of Raman scattering 22 2.2 Raman scattering process theory 23 2.3 Polarization and symmetry selection rules 27 Chapter 3 Experiment apparatus and methods 30 3.1 Fabrication of Bi-2212 samples 30 3.1.1 The fabrication process of Bi-2212 samples 30 3.1.2 Transfer hBN using PDMS dry transfer method 31 3.2 Optical measurement 34 3.2.1 Raman measurement 34 3.2.2 Polarized and crystal-angle-resolved Raman measurement 36 3.2.3 Bi-2212 Raman data processing 38 3.3 Furnace annealing systems 39 3.4 Atomic force microscopy 41 Chapter 4 Polarized Raman scattering in Bi-2212 42 4.1 Space group and group symmetry of Bi-2212 42 4.2 Raman spectra of Bi-2212 48 4.2.1 Single-crystalline of Bi-2212 48 4.2.2 Polarized Raman spectra of Bi-2212 and peak assignment 50 4.3 Raman intensity dependence on crystal orientation 60 4.3.1 The classical Raman selection rule 60 4.3.2 The Raman selection rule with considering the birefringence effect and the anisotropic absorption 64 4.3.3 The anomalous mode with asymmetric lineshape 71 4.4 Summary 73 Chapter 5 Analysis Bi-2212 chemical stability using Raman spectroscopy 75 5.1 Bi-2212 stability under different storage conditions 75 5.2 Bi-2212 stability under different thermal treatments 77 5.2.1 Aged Bi-2212 samples under Ar/O2 annealing 77 5.2.2 Aged Bi-2212 samples under vacuum annealing 83 5.2.3 Freshly cleaved Bi-2212 samples under Ar/O2 and vacuum annealing 89 Chapter 6 Conclusion 94 Future Prospect 96 REFERENCES 97 | - |
| dc.language.iso | en | - |
| dc.title | 利用偏振解析拉曼散射研究層狀鉍鍶鈣銅氧之晶格對稱性及熱穩定性 | zh_TW |
| dc.title | Studies of Crystal Symmetry and Thermal Stability of Layered Bismuth Strontium Calcium Copper Oxide Using Polarization-resolved Raman Scattering | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 111-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.coadvisor | 王偉華 | zh_TW |
| dc.contributor.coadvisor | Wei-Hua Wang | en |
| dc.contributor.oralexamcommittee | 林昭吟 | zh_TW |
| dc.contributor.oralexamcommittee | Jauyn-Grace Lin | en |
| dc.subject.keyword | 鉍鍶鈣銅氧,偏振解析拉曼光譜,光學吸收,熱可靠性, | zh_TW |
| dc.subject.keyword | Bi-2212,Polarization-resolved Raman,Optical absorption,Thermal reliability, | en |
| dc.relation.page | 103 | - |
| dc.identifier.doi | 10.6342/NTU202301379 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2023-07-10 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 應用物理研究所 | - |
| 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-111-2.pdf 此日期後於網路公開 2026-07-06 | 8.86 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。