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Epitaxial Growth of Ba(Fe_1-xCo_x)_2As_2 and LiFeAs Pnictide Layers using Pulsed Laser Deposition : 펄스 레이저 증착법을 이용한 Ba(Fe_1-xCo_x)_2As_2와 LiFeAs 닉타이드 화합물층의 에피탁시 성장

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dc.contributor.advisor국양-
dc.contributor.author이한호-
dc.date.accessioned2017-07-19T09:12:30Z-
dc.date.available2017-07-19T09:12:30Z-
dc.date.issued2016-08-
dc.identifier.other000000136363-
dc.identifier.urihttps://hdl.handle.net/10371/131645-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 물리·천문학부 물리학전공, 2016. 8. 국양.-
dc.description.abstractMost scanning tunneling microscopy (STM) investigations of high-Tc superconductors have been performed on the cleaved surface of single crystal samples. However, the combination of STM with well-controlled growth, such as molecular beam epitaxy (MBE) and pulsed laser deposition (PLD), overcomes problems due to various imperfections in materials and ambient contamination, and therefore enables researchers to reveal the intrinsic properties. In this thesis, I will present STM investigation of superconducting iron pnictide thin films grown by PLD. Epitaxial thin films of Ba(Fe1-xCox)2As2 and LiFeAs were grown on SrTiO3(001) substrates and examined in a STM chamber directly connected to the growth chamber. The crystallinity of the epitaxial thin films was monitored using reflection high-energy electron diffraction (RHEED) and low energy electron diffraction (LEED) during and after deposition. A (2×2) structure was observed in the Ba(Fe1-xCox)2As2 surface. A (1×1) structure was revealed in the LiFeAs surface. These films exhibited superconducting behavior in four probe transport measurements.-
dc.description.tableofcontentsChapter 1. Introduction 1
1.1 Scanning tunneling microscopy studies of high temperature superconductors 1
1.2 In-situ scanning tunneling microscopy studies of epitaxially grown high temperature superconductors 3
1.3 Pulsed laser deposition growth of iron pnictide superconducting thin films 5

Chapter 2. Experimental techniques 7
2.1 Scanning Tunneling Microscopy (STM) 7
2.1.1 Principle of STM 7
2.1.2 A breif description of our STM used in this experiment 9
2.2 MBE-PLD system 11
2.2.1 Pulsed laser deposition (PLD) 11
2.2.2 Molecular beam epitaxy (MBE) 11
2.2.3 Reflection high energy electron diffraction (RHEED) 13
2.2.4 Low energy electron diffcation (LEED) 14
2.2.5 MBE-PLD growth system used in this experiment 15

Chapter 3. Epitaxial growth of Ba(Fe1-xCox)2As2 and LiFeAs on SrTiO3(001) using Pulsed Laser Deposition 17
3.1 SrTiO3(001) substrate 17
3.2 Laser parameter optimization 19
3.3 Deposition rate measurement 20
3.4 Substrate temperature dependence of Co-doped Ba-122 growth 21
3.5 Surface Characterization of Co-doped Ba-122 films 24
3.6 Superconducting property of Co-doped Ba-122 films 27
3.7 Substrate temperature dependence of LiFeAs growth 29

Bibliography 32

Appendix. MBE growth of Bi2(Te1-xSex)3 35

Abstract in Korean 38
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dc.formatapplication/pdf-
dc.format.extent2075519 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectthin film growth of high temperature superconductors-
dc.subject.ddc523-
dc.titleEpitaxial Growth of Ba(Fe_1-xCo_x)_2As_2 and LiFeAs Pnictide Layers using Pulsed Laser Deposition-
dc.title.alternative펄스 레이저 증착법을 이용한 Ba(Fe_1-xCo_x)_2As_2와 LiFeAs 닉타이드 화합물층의 에피탁시 성장-
dc.typeThesis-
dc.description.degreeMaster-
dc.citation.pages38-
dc.contributor.affiliation자연과학대학 물리·천문학부-
dc.date.awarded2016-08-
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