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1,129 results on '"Ōnuki, Yoshichika"'

163. CEF-scheme of a semimetal [formula omitted]

Author

Okuda, Yusuke, Yamamoto, Takeshi, Honda, Daisuke, Shishido, Hiroaki, Galatanu, Andrei, Haga, Yoshinori, Matsuda, Tatsuma D., Takeuchi, Tetsuya, Kindo, Koichi, Sugiyama, Kiyohiro, Settai, Rikio, and Ōnuki, Yoshichika

Published
2005
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173. Charge-Density-Wave Order and Multiple Magnetic Transitions in Divalent Europium Compound EuAl4.

Author

Kaneko, Koji, Kawasaki, Takuro, Nakamura, Ai, Munakata, Koji, Nakao, Akiko, Hanashima, Takayasu, Kiyanagi, Ryoji, Ohhara, Takashi, Hedo, Masato, Nakama, Takao, and Ōnuki, Yoshichika

Abstract

Multiple transition phenomena in divalent Eu compound EuAl4 with the tetragonal structure were investigated via the single-crystal time-of-flight neutron Laue technique. At 30.0 K below a charge-density-wave (CDW) transition temperature of TCDW = 140 K, superlattice peaks emerge near nuclear Bragg peaks described by an ordering vector \(\boldsymbol{q}_{\text{CDW}} = (0,0,\delta _{c})\) with δc ∼ 0.19. In contrast, magnetic peaks appear at \(\boldsymbol{q}_{2} = (\delta _{2},\delta _{2},0)\) with δ2 = 0.085 in a magnetic-ordered phase at 13.5 K below TN1 = 15.4 K. By further cooling to below TN3 = 12.2 K, the magnetic ordering vector changes into \(\boldsymbol{q}_{1} = (\delta _{1},0,0)\) with δ1 = 0.17 at 11.5 K and slightly shifts to δ1 = 0.194 at 4.3 K. No distinct change in the magnetic Bragg peak was detected at TN2 = 13.2 K and TN4 = 10.0 K. The structural modulation below TCDW with qCDW is characterized by the absence of the superlattice peak in the (0 0 l) axis. As a similar CDW transition was observed in SrAl4, the structural modulation with qCDW could be mainly ascribed to the displacement of Al ions within the tetragonal ab-plane. Complex magnetic transitions are in stark contrast to a simple collinear magnetic structure in isovalent EuGa4. This could stem from different electronic structures with the CDW transition between two compounds. [ABSTRACT FROM AUTHOR]

Published
2021
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177. Magnetic Fluctuation and First-Order Transition in Trillium Lattice of EuPtSi Observed by 151Eu Mössbauer Spectroscopy

Author

Homma, Yoshiya, primary, Kakihana, Masashi, additional, Tokunaga, Yo, additional, Yogi, Mamoru, additional, Nakashima, Miho, additional, Nakamura, Ai, additional, Shimizu, Yusei, additional, Li, Dexin, additional, Maurya, Arvind, additional, Sato, Yoshiki J., additional, Honda, Fuminori, additional, Aoki, Dai, additional, Amako, Yasushi, additional, Hedo, Masato, additional, Nakama, Takao, additional, and Ōnuki, Yoshichika, additional

Published
2019
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186. De Haas–van Alphen Oscillations for Small Electron Pocket Fermi Surfaces and Huge H-linear Magnetoresistances in Degenerate Semiconductors PbTe and PbS

Author

Kawakatsu, Shoya, primary, Nakaima, Kenri, additional, Kakihana, Masashi, additional, Yamakawa, Yui, additional, Miyazato, Hayato, additional, Kida, Takanori, additional, Tahara, Time, additional, Hagiwara, Masayuki, additional, Takeuchi, Tetsuya, additional, Aoki, Dai, additional, Nakamura, Ai, additional, Tatetsu, Yasutomi, additional, Maehira, Takahiro, additional, Hedo, Masato, additional, Nakama, Takao, additional, and Ōnuki, Yoshichika, additional

Published
2019
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189. Electronic States of Antiferromagnet FeSn and Pauli Paramagnet CoSn

Author

Kakihana, Masashi, primary, Nishimura, Kengo, additional, Aoki, Dai, additional, Nakamura, Ai, additional, Nakashima, Miho, additional, Amako, Yasushi, additional, Takeuchi, Tetsuya, additional, Kida, Takanori, additional, Tahara, Time, additional, Hagiwara, Masayuki, additional, Harima, Hisatomo, additional, Hedo, Masato, additional, Nakama, Takao, additional, and Ōnuki, Yoshichika, additional

Published
2019
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