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Fe-based superconducting thin films: current status and new perspective

日程 : 2019年11月27日(水) 1:30 pm - 2:30 pm 場所 : 物性研究所本館6階 第5セミナー室 (A615) 講師 : Professor Silvia Haindl 所属 : Institute of Innovative Research, Tokyo Institute of Technology 世話人 : 長谷川 幸雄

Thin films of Fe-based superconductors (Fe-pnictides, Fe-chalcogenides) have been synthesized and studied for about one decade in more than 500 publications. Despite the plethora of compounds within the family of new superconductors, the majority of thin film studies focused on FeSe (FeSe1-xTex) and BaFe2-xCoxAs2, because these compounds could be grown easily and successfully by pulsed laser deposition (PLD) and they showed, furthermore, high critical current densities (105 – 106 Acm-2) at liquid helium temperatures. Ultrathin Fe-chalcogenide films show also an electrostatic doping effect in electric-double-layer-transistor devices. In addition, the boost of transition temperature to 65 – 75 K in monolayer FeSe films grown by molecular beam epitaxy (MBE) has raised many new questions on the superconducting mechanism. Thin films of the more complex, layered anion compounds of Fe-oxyarsenides are less investigated because their synthesis is more difficult. Recently, progress was made in growing Fe-oxyarsenides and new heterostructures including different types of pnictide layers by using PLD. After giving an overview about the current status of thin film growth of the different Fe-based superconductors I will turn towards selected own investigations. Besides the conventionally explored high-field applications, new perspectives for Fe-based superconductors in the field of electronic devices will be discussed.


(公開日: 2019年11月11日)