Author: "Akihiko Sumiyama" / Database: Supplemental Index - Searchworks@Jio Institute Digital Library Search Results

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Author: Kazuyuki Takahashi, Kiko Kawamukai, Tomoyuki Mochida, Takahiro Sakurai, Hitoshi Ohta, Takashi Yamamoto, Yasuaki Einaga, Hatsumi Mori, Yasuyuki Shimura, Toshiro Sakakibara, Takumi Fujisawa, Akira Yamaguchi, and Akihiko Sumiyama
Abstract: A novel star-shaped high-spin Fe(III) tetranuclear cluster was unexpectedly obtained by the reaction of an [FeIII(phsal)2]- anion with an Fe(II) coordination cation (H2phsal: N-(2-hydroxyphenyl)salicylaldimine). Despite a star-shaped Fe(III) tetranuclear structure similar to reported Fe(III) single molecule magnets, the present compound exhibited a bulk antiferromagnetic transition at 0.6K due to a magnetic exchange coupling through intercluster π-stacking interactions. [ABSTRACT FROM AUTHOR]
Published: 2015
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Author: Hirayama, Toshikazu, Nakagawa, Masahito, Akihiko-Sumiyama, and Oda, Yasukage
Abstract: We report the thermal history dependence of the superconducting properties in the ceramic La2CuO4+δwith excess oxygen. In the sample, annealed in high pressure oxygen gas, the transition temperatureTconset of 32K in rapidly cooling case changes into 37K in case of annealing at 200K. Another superconducting phase withTcaround 45K was found to be enhanced in the samples annealed around 220K, both in the de susceptibility and resistivity measurements. We also studied thermal history dependence in the samples with electrochemical oxidation. And we observed theTconset of 45K, however theTconset of 45K did not change by thermal history.
Published: 1996
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