1 Introduction
1.1 Iron-Based Superconductor (FeSC)
1.2 Crystal Structure and Magnetic Order of FeSC
1.3 Phase Diagram of FeSC
1.4 Superconducting Property
1.5 Normal State Property
1.6 Aim of This Study
2 Experimental Methods
2.1 Single Crystal Growth
2.2 Transport Measurement
2.3 Magnetization
2.4 X-Ray Diffraction Measurement
2.5 Specific Heat Measurement
2.6 Optical Measurement
3 Electronic Phase Diagram and Superconducting Property of SrFe2(As1-xPx)2
3.1 Introduction
3.2 Annealing Effect
3.3 Structural Analysis
3.4 Transport Measurement
3.5 Magnetic Susceptibility Measurement
3.6 Electronic Phase Diagram
3.7 Specific Heat in Superconducting State
3.8 Summary
4 In-Plane Resistivity Anisotropy of Ba(Fe1-xTMx)22 (TM=Cr, Mn, and Co)
4.1 Introduction
4.2 Resistivity Measurement with Detwinned Crystals
4.3 Hall Effect in Cr and Mn-Ba122
4.4 Relation Between RH and Δρ
4.5 Discussion on the Origin of Resistivity Anisotropy
4.6 Summary
5 Optical Property of Ba(Fe1-xTMx)2As2 (TM=Cr, Mn, and Co)
5.1 Introduction
5.2 Doping Dependence of Optical Spectra
5.3 Fitting of σ(ω) with Drude-Lorentz Model
5.4 Transition Metal Doping Effect on the AFO State
5.5 Magnetic/Non-magnetic Impurity Effect
5.6 Localized Carrier Induced by Mn/Cr-Doping
5.7 Summary
6 Conclusion
6.1 Structural and Superconductivity Property in P-Sr122
6.2 Resistivity Anisotropy in Ba(Fe1-xTMx)2As2 (TM=Cr, Mn, and Co)
6.3 Optical Conductivity in TM-Ba122
6.4 Summary
6.5 Future Work
About the Author: Tatsuya Kobayashi is an experimentalist in condensed-matter physics, and his work is concerned with strongly correlated electron systems and iron-based superconductors.
Tatsuya Kobayashi received a Bachelor of Science, Master of Science, and Ph.D. from the Department of Physics, Graduate School of Science, Osaka University in 2011, 2013, and 2016, respectively. During his graduate program, he joined the group led by Professor Setsuko Tajima in the Department of Physics, Osaka University. Between April 2014 and March 2016, he was awarded a research fellowship for young scientists (DC2) by the Japan Society for the Promotion of Science (JSPS), and his research was supported by JSPS.
