University of the Ryukyus · Faculty of Science · 准教授

Research keywords強相関電子系・固体物性

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• Antiferromagnetic state in EuAl4 studied by 27Al zero-field NMR2024 · Niki H.
• Nuclear-spin evidence of insulating and antiferromagnetic state of CuO2 planes in superconducting Pr2Ba4Cu7O15−δ2022 · Abstract In contrast to the “Pr-issue” that neither PrBa₂Cu₃O₇ (Pr123) nor PrBa₂Cu₄O₈ (Pr124) shows superconductivity (SC), we have observed 100%-fraction of SC in an oxygen-reduced Pr₂Ba₄Cu₇O_15−δ (Pr247) which has a hybrid structure that Pr247 = Pr123 + Pr124. It is found that Cu nuclear-spin signals from the CuO₂ planes observed at 300 K are completely wiped out at 2 K. Instead, the plane signals at 2 K are observed at higher frequencies. This indicates that, despite the bulk SC, the CuO₂ planes in Pr247 are found to be in an insulating and antiferromagnetically ordered state.
• Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies2021 · N. Higa, T. U. Ito, M. Yogi, T. Hattori, H. Sakai, S. Kambe, Z. Guguchia, W. Higemoto, M. Nakashima, Y. Homma, A. Nakamura, F. Honda, Y. Shimizu, D. Aoki, M. Kakihana, M. Hedo, T. Nakama, Y. Onuki, Y. Tokunaga
• NMR Study of Characteristic CDW Transition in SrAl42020 · Haruo Niki, Hiroko Kuroshima, Nonoka Higa, Mach Morishima, Mamoru Yogi, Ai Nakamura, Kaori Niki, Takahiro Maehira, Masato Hedo, Takao Nakama, and Yoshichika Ōnuki

• 磁性化処理で発現するゼオライトの特異な低磁場配向性の挙動解明と材料設計への応用2024 · 基盤研究(B)
• NMR/NQRを用いた電気多極子秩序の対称性の同定2024 · 基盤研究(B)
• 籠状構造による非調和格子振動とサイト選択的元素置換による新奇電子状態の微視的解明2018 · 基盤研究(C)
• スクッテルダイト類似構造を持つ物質の重い電子状態と新奇物性の核磁気共鳴による研究2011 · 新学術領域研究

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