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

Title
Optical Properties for Superconducting electron doped Ca10(Pt3As8)(Fe2As2)5 and parent Ca10(Pt4As8)(Fe2As2)5 single crystals.
Authors
Yuil Seo
DGIST Authors
Seo, Yuil; Lee, KijoonKwon, Yong Seung
Advisor(s)
권용성
Co-Advisor(s)
Kijoon Lee
Issue Date
2019
Available Date
2019-10-03
Degree Date
2019-02
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
University
DGIST
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
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Collection:
Department of Emerging Materials ScienceThesesPh.D.


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