DGIST Scholar: Optical properties of superconducting Ca10(Pt3As8)(Fe2As2)5 doped with electrons and holes

Department of Physics and Chemistry Theses Ph.D.

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Optical properties of superconducting Ca10(Pt3As8)(Fe2As2)5 doped with electrons and holes

Title: Optical properties of superconducting Ca10(Pt3As8)(Fe2As2)5 doped with electrons and holes

Alternative Title: 전자와 정공이 도핑 된 초전도 Ca10(Pt3As8)(Fe2As2)5의 광학적 특성

Author(s): Woojae Choi

DGIST Authors: Woojae Choi ; Yong Seung Kwon ; Heon-Jung Kim

Advisor: 권용성

Co-Advisor(s): Heon-Jung Kim

Issued Date: 2021

Awarded Date: 2021/02

Type: Thesis

Subject: Iron-based superconductor, optical spectroscopy, strong electron correlation, Hund’s rule coupling, pseudo gap, 철 기반 초전도체, 비 재래적인 초전도체, 광학 분광법, 강상관관계, 유사갭, Hund 규칙 결합

Table Of Contents: Contents

Abstract i

Chapter 1. Introduction 1
Chapter 2. Iron-based superconductors Ca10(Pt3As8)(Fe2As2)5
2.1 Crystals structure of Ca10(Pt3As8)(Fe2As2)5 and Ca10(Pt4As8)(Fe2As2)5 7
2.2 Crystal structure of La doped Ca10(Pt3As8)(Fe2As2)5 single crystal 9
2.3 Transport properties of Ca10(Pt3As8)(Fe2As2)5
2.3.1. Parent Ca10(Pt3As8)(Fe2As2)5 compound 14
2.3.2. Doping dependence of Ca10(Pt3As8)(Fe2As2)5 compound 15
2.4 Electronic structure of Ca10(Pt3As8)(Fe2As2)5 and Ca10(Pt4As8)(Fe2As2)5 17
2.5 Optical properties of iron-based superconductors
2.5.1. Optical properties of Pt doped Ca10(Pt3As8)(Fe2As2)5 compound 20
2.5.2. Psuedogap and electronic correlations in iron-based superconductor 23
References 28
Chapter 3. Experimental and Theoretical Methods
3.1. Synthesis methods of single crystal
3.1.1. Single crystals grown by vertical Bridgman method 32
3.1.2. Single crystal growth of La & Na doped Ca 10-3-8 compound 35
3.2. Transport measurement
3.2.1. Electrical resistivity measurement and measurement systems 37
3.2.2. Magnetoresistivity and Hall resistivity 39
3.3. Optical Spectroscopy
3.3.1. The principle of Fourier-transform spectroscopy 42
3.3.2. Fourier-transform infrared spectroscopy 45
3.3.3. Kramers-Kronig (K-K) relations for reflectivity analysis 50
3.3.4. Sum rules 52
3.3.5. Drude-Lorentz model 53
3.3.6. Superconducting gaps 55
References 57
Chapter 4. Results and Discussion
4.1 Superconducting-induced transfer of spectral weight due to microscopic coexistence of superconducting and magnetic correlation 58
References. 82
4.2 Optical properties in the hole-doped Ca8.5Na1.5(Pt3As8)(Fe2As2)5 single crystal with strong electron correlations 83
Referencee 111