電子顕微鏡の空間分解能は20世紀後半に発明された球面収差補正器のおかげでその分解能は既にsub-Åの領域に達しています。現在では水素を含む周期表のすべての原子を直接見ることができます。我々のグループでは、電子顕微鏡でしか分析することができない結晶欠陥や結晶界面などの非周期な領域における原子位置をpmの精度で分析し、物性との関係性を研究しています。
また、電子顕微鏡では高速の高ネルギー電子線を使用することから電子線に弱い材料の研究には制限があります。我々のグループでは電子線に弱い有機結晶にフォーカスし、有機結晶の結晶欠陥の研究を進めています。
"Anisotropic in-plane lattice strain relaxation in brownmillerite
SrFeO2.5 epitaxial thin films", Kei Hirai, Daisuke Kan, Ryotaro Aso,
Noriya Ichikawa, Hiroki Kurata and Yuichi Shimakawa; J. Appl. Phys., 114,
053514-1-6 (2013).
"Atomic level observation of octahedral distortions at the perovskite
oxide heterointerface",Ryotaro Aso, Daisuke Kan, Yuichi Shimakawa
and Hiroki Kurata;Scientific Reports, 3,2214; DOI:10.1038/srep02214 (2013).
"Epitaxial strain effect in tetragonal SrRuO3 thin films",Daisuke
Kan, Ryotaro Aso, Hiroki Kurata, and Yuichi Shimakawa; J. Appl. Phys.,
113, 173912-1-7 (2013).
"Thickness-Dependent Structure–Property Relationships in Strained
(110) SrRuO3 Thin Films", Daisuke Kan, Ryotaro Aso, Hiroki Kurata
and Yuichi Shimakawa; Adv. Funct. Mater., 23,1129–1136(2013).
"Control of Structural Distortions in Transition-Metal Oxide Films
through Oxygen Displacement at the Heterointerface",
Ryotaro Aso, Daisuke Kan, Yuichi Shimakawa and Hiroki Kurata;
Adv. Funct. Mater., 24,5177-5184(2014).
"Octahedral Tilt Propagation Controlled by A‑Site Cation Size at Perovskite
Oxide Heterointerfaces",
Ryotaro Aso, Daisuke Kan, Yuichi Shimakawa and Hiroki Kurata;
Cryst. Growth Des., 14,2128-2132 (2014).
"Band-to-band photoluminescence as a probe of electron carriers in
Nb-doped SrTiO3 epitaxial thin films",
Daisuke Kan, Takuya Shimizu, Yasuhiro Yamada, Ryotaro Aso, Hiroki Kurata,
Yoshihiko Kanemitsu and Yuichi Shimakawa;
Appl. Phys. Exp., 7,015503 (4 pages)(2014).
"Research Update: Interface-engineered oxygen octahedral tilts in
perovskite oxide heterostructures", Daisuke Kan, Ryotaro Aso, Hiroki
Kurata, and Yuichi Shimakawa; APL Materials, 3,062302 (9 pages) (2015)
"Phase control of a perovskite transition-metal oxide through oxygen
displacement at the heterointerface",Daisuke Kan, Ryotaro Aso, Hiroki
Kurata and Yuichi Shimakawa; Dalton Trans., 44,10594-10607 (2015).
"Tuning magnetic anisotropy by interfacially engineering the oxygen
coordination environment in a transition metal oxide",Daisuke Kan,
Ryotaro Aso, Riko Sato, Mitsutaka Haruta, Hiroki Kurata and Yuichi Shimakawa;
Nat. Mater., 15, 432-438 (2016)).
"Understanding ordered structure in hematite nano whiskers synthesized
via thermal oxidation of iron-based substrates",
Ming-Wei Lai and Hiroki Kurata,
Materials & Design (2020): https://doi.org/10.1016/j.matdes.2020.108596
"Direct observation of crystal defects in an organic molecular crystals of copper hexachlorophthalocyanine by STEM-EELS", Mitsutaka Haruta and Hiroki Kurata; Sci. Rep., 2,252; DOI:10.1038/srep00252 (2012).