"Towards Bulk 49K Superconductivity in the Intermetallic CaFe₂As₂"
Mr. Tyler Drye

Nov 18, 2013

日本物理学会北海道支部講演会
トポロジー理工学教育研究センター第195回エンレイソウの会共催
講演題目：　Towards Bulk 49 K Superconductivity in the Intermetallic CaFe₂As₂
講　師　：　Mr. Tyler Drye
　　　　　Department of Physics, University of Maryland College Park
(Visiting scholar by ICMR International Research Fellowship)
日　時　：　平成25年11月18日 (月) 15:00-16:00
場　所　：　北海道大学理学部２号館409室（2-4-09）

要　旨　：
The highest achievable superconducting critical temperature (Tc) in intermetallic iron-pnictide superconductors (specifically, the 122 family) was heald to be 39K when K is substituted for Ba in BaFe₂As₂. Our group was among the first to report traces of superconductivity in the 40-50K range when rare earth elements are doped for Ca in CaFe₂As₂. Unfortunately, these materials display a drastically low shielding volume fraction and correspondingly low critical current densities. Recent studies aimed at increasing this volume fraction, including high pressure synthesis and unusual doping schemes, have met with varying levels of success. This talk will detail these efforts and the outlook for bulk superconductivity in this system.

世話人　 柳澤達也
（tatsuya@phys.sci.hokudai.ac.jp）
北海道大学大学院理学研究院物理学部門