Seminar & Colloquium
[세미나: 7월 9일(화), 오후 4시] Prof. Prof. Jong-Hoon Kang, Pohang University of Science and Technology (POSTECH)
Title
Epitaxial thin film synthesis of Fe-based superconductors
Speaker
Prof. Jong-Hoon Kang, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)
* Education
- 2018 Ph.D. University of Wisconsin-Madison, Materials Science and Engineering
Laboratory of Prof. Chang-Beom Eom
Dissertation: “Atomic Structure Design in Iron Based Superconductors”
- 2014 M.S. University of Wisconsin-Madison, Materials Science and Engineering
Laboratory of Prof. Chang-Beom Eom
Thesis: “Emergence of Superconductivity by Atomic Geometry and Symmetry Design”
- 2003 M.S. Seoul National University, Materials Science and Engineering
Laboratory of Prof. Euijoon Yoon
Thesis: “InGaAs/InP Quantum Well Infrared Photodetector”
- 2001 B.S. Seoul National University, Materials Science and Engineering
* Professional Experience
- 2022.09.-Present Assistant Professor, Department of Materials Science and Engineering, POSTECH
- 2022.10.-Present Senior Research Fellow/POSTECH Campus Personnel, Institute for Basic Science (IBS)
- 2019.03.-2022.07. Postdoctoral Research Scholar, Department of Chemistry, University of Chicago (Laboratory of Prof. Jiwoong Park)
- 2013.06.-2019.02. Graduate Student Researcher, Materials Science and Engineering, University of Wisconsin-Madison (Laboratory of Prof. Chang-Beom Eom)
- 2005.09.-2013.06. Research Scientist, Samsung Electronics Semiconductor R&D Center
- 2003.07.-2005.08. Research Scientist, LG Chemical R&D Center
- 2001.03.-2003.02. Graduate Student Researcher, Materials Science and Engineering, Seoul National University
| Date | Tuesday, July 9th , 2024
| Time | 16:00 ~
| Venue | 33동 222호(동부 세미나실)
[Abstract]
Significant progress has been made in fabricating high-quality thin film heterostructures of iron-based superconductors. Heteroepitaxy offers the possibility of tailoring structural distortions at the atomic scale and enhancing superconducting properties. Here, we report that suppressed orthorhombic distortion of parent compound BaFe2As2 by lattice clamping effects leads to the emergence of superconductivity with the transition temperature (Tc). We have found that the As-Fe-As bond angles in the presence of tetragonal-to-orthorhombic transition approached the optimum angle of 109.5o at a reduced film thickness. Synchrotron x-ray diffraction and resonant scattering show that the As-Fe-As bond angle and Tc are systematically tuned by the BaFe2As2 thickness and reach maximum Tc when bond angles are equal to 109.5o. This finding can provide a path towards tailoring superconducting properties and understanding superconductivity in other Fe-based superconducting thin films such as monolayer FeSe.
| Host | 이건도 교수(02-880-5898)