Title

Optical Properties for Superconducting electron doped Ca10(Pt3As8)(Fe2As2)5 and parent Ca10(Pt4As8)(Fe2As2)5 single crystals.

DGIST Authors

Lee, Kijoon ; Seo, Yuil ; Kwon, Yong Seung

Advisor

권용성

Co-Advisor(s)

Kijoon Lee

Issued Date

2019

Awarded Date

2019-02

Citation

Yuil Seo. (2019). Optical Properties for Superconducting electron doped Ca10(Pt3As8)(Fe2As2)5 and parent Ca10(Pt4As8)(Fe2As2)5 single crystals. doi: 10.22677/thesis.200000171451

Type

Thesis

Table Of Contents

Contents

Abstract i

Chapter 1. Introduction 1
References 8

Chapter 2. Physical properties of the Ca10(PtnAs8)(Fe2As2)5 (n=3, 4) 9
2.1 Crystal Structure of the Ca10(PtnAs8)(Fe2As2)5 (n = 3, 4 ) 9
2.2 Electronic Structure of the Ca10(PtnAs8)(Fe2As2)5 (n = 3, 4) 10
2.3 Optical properties of iron-based superconductors 14
2.4 Phase diagram 21
References 26

Chapter 3. Experimental and theoretical methods 27
3.1. Single crystal growth 27
3.2. Bridgman method 28
3.3. Single crystal growth of Ca10(PtnAs8)(Fe2As2)5 (n = 3, 4) 29
3.4. Fourier-transform infrared spectroscopy 30
3.5. Optical constants 39
3.6 Kramers-Kronig Relation 43
3.7 Drude-Lorentz Model 44
3.8 Sum rules 49
3.9 Superconducting gap response in optical conductivity 51
References 53

Chapter 4. Results and Discussion 54
4.1. Optical properties of optimally doped single-crystal Ca8.5La1.5(Pt3As8)(Fe2As2)5 54
4.2. Temperature dependence of the superconducting energy gaps in Ca9.35La0.65(Pt3As8)(Fe2As2)5 single crystal 82
4.3. Evidence for a preformed Cooper pair model in the pseudogap spectra of a Ca10(Pt4As8)(Fe2As2)5 single crystal with a nodal superconducting gap 103

Chapter 5. Conclusions 123

Acknowledgment 126

URI

http://dgist.dcollection.net/common/orgView/200000171451
http://hdl.handle.net/20.500.11750/10682

DOI

10.22677/thesis.200000171451

Degree

DOCTOR

Department

Emerging Materials Science

Publisher

DGIST

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