T
T. Ishikawa
Researcher at Tokyo Institute of Technology
Publications - 27
Citations - 3372
T. Ishikawa is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Photoexcitation & Chemistry. The author has an hindex of 10, co-authored 22 publications receiving 3058 citations.
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Lanthanide Double-Decker Complexes Functioning as Magnets at the Single-Molecular Level
TL;DR: Double-decker phthalocyanine complexes with Tb3+ or Dy3+ showed slow magnetization relaxation as a single-molecular property and a significant temperature rise results from a mechanism in the relaxation process different from that in the transition-metal-cluster SMMs.
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Mononuclear Lanthanide Complexes with a Long Magnetization Relaxation Time at High Temperatures: A New Category of Magnets at the Single-Molecular Level
TL;DR: In this article, an alternating current (ac) magnetic susceptibility and magnetization hysteresis loop measurements have been carried out for anionic bis(phthalocyaninato)terbium and bis (phthalocyclichenato)dysprosium and it has been found that the magnetization relaxation in the Tb complex is dominated by the two-phonon Orbach process in the temperature range 25−40 K and direct or Raman process below 25 K.
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Gigantic Photoresponse in ¼-Filled-Band Organic Salt (EDO-TTF)2PF6
Matthieu Chollet,Laurent Guérin,Laurent Guérin,Naoki Uchida,Souichi Fukaya,Hiroaki Shimoda,T. Ishikawa,Kazunari Matsuda,T. Hasegawa,Akira Ota,Hideki Yamochi,Gunzi Saito,Ryoko Tazaki,Ryoko Tazaki,Shin-ichi Adachi,Shin-ya Koshihara,Shin-ya Koshihara +16 more
TL;DR: The observed photo-induced spectroscopic change shows that this photoinduced phase transition process is caused by the cooperative melting of charge ordering assisted by coherent phonon generation.
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Upward temperature shift of the intrinsic phase lag of the magnetization of Bis(phthalocyaninato)terbium by ligand oxidation creating an S = 1/2 spin.
TL;DR: The ac susceptibility measurements on the complex with octa(dodecoxy)-substituted Pc ligand proved that the significant rise of the temperatures occurs as an intrinsic single-molecular property of the complex possessing both J = 6 and S = (1)/(2) systems, and is not due to long-range magnetic order or interactions between adjacent unpaired pi-electrons.
Journal ArticleDOI
Direct observation of collective modes coupled to molecular orbital-driven charge transfer.
T. Ishikawa,Stuart A. Hayes,Stuart A. Hayes,Sercan Keskin,Sercan Keskin,Gastón Corthey,Gastón Corthey,Masaki Hada,Masaki Hada,Kostyantyn Pichugin,Alexander Marx,Alexander Marx,Julian Hirscht,Julian Hirscht,Kenta Shionuma,Ken Onda,Yoichi Okimoto,Shin-ya Koshihara,Takashi Yamamoto,Hengbo Cui,Mitsushiro Nomura,Yugo Oshima,M. Abdel-Jawad,Reizo Kato,R. J. Dwayne Miller,R. J. Dwayne Miller,R. J. Dwayne Miller +26 more
TL;DR: The ultrafast photoresponse of the molecular crystal Me4P[Pt(dmit)2]2 is reported, which exhibits a photoinduced charge transfer similar to transitions between thermally accessible states, and how femtosecond electron diffraction can be applied to directly observe the associated molecular motions.