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Journal Articles

Local Ir dedimerization followed by ligand-hole hopping in X-ray irradiated thiospinel

Hiraka, Haruhiro*; Matsumura, Daiju; Horigane, Kazumasa*; Mizuki, Junichiro*

Journal of Physics and Chemistry of Solids, 150, p.109870_1 - 109870_8, 2021/03

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

Journal Articles

Spin excitations in hole-overdoped iron-based superconductors

Horigane, Kazumasa*; Kiho, Kunihiro*; Fujita, Kei*; Kajimoto, Ryoichi; Ikeuchi, Kazuhiko*; Ji, S.*; Akimitsu, Jun*; Lee, C. H.*

Scientific Reports (Internet), 6, p.33303_1 - 33303_6, 2016/09

 Times Cited Count:12 Percentile:65.83(Multidisciplinary Sciences)

Journal Articles

Antiferromagnetic order of the Co$$^{2+}$$ high-spin state with a large orbital angular momentum in La$$_{1.5}$$Ca$$_{0.5}$$CoO$$_{4}$$

Okamoto, Jun*; Nakao, Hironori*; Yamasaki, Yuichi*; Wadachi, Hiroki*; Tanaka, Arata*; Kubota, Masato; Horigane, Kazumasa*; Murakami, Yoichi*; Yamada, Kazuyoshi*

Journal of the Physical Society of Japan, 83(4), p.044705_1 - 044705_6, 2014/04

 Times Cited Count:7 Percentile:51.07(Physics, Multidisciplinary)

Oral presentation

Magnetic excitations in oxygen doped La$$_{2}$$CoO$$_{4.24}$$

Kajimoto, Ryoichi; Nakajima, Kenji; Nakamura, Mitsutaka; Inamura, Yasuhiro; Horigane, Kazumasa*; Hiraka, Haruhiro*; Yamada, Kazuyoshi*; Arai, Masatoshi

no journal, , 

no abstracts in English

Oral presentation

Spin fluctuations in oxygen doped layered perovskite cobalt oxide

Nakajima, Kenji; Kajimoto, Ryoichi; Yamada, Kazuyoshi*; Horigane, Kazumasa*

no journal, , 

Carrier doping into transition metal oxides triggers various phenomena, which have been subjected to intensive investigations. Layered oxide La$$_{2}$$MO$$_{4}$$ (M: 3d metal) is one of the model systems for such studies. In cobalates, contribution of orbital moment and possible spin state of Co$$^{3+}$$ give further complexity. In La$$_{1.5}$$Sr$$_{0.5}$$CoO$$_{4}$$, charges order in checker-board style and Co$$^{2+}$$ spin correlations are modulated in momentum space by the ordered charges. (1) Magnetic excitations in this system are reported to be accounted for spin-waves of Co$$^{2+}$$ spins taking into account the orbital moment. (2) In this study, we have investigated magnetic excitations in another almost half-doped system La$$_{2}$$CoO$$_{4.24}$$ by inelastic neutron scattering. Clear spin-wave excitations consistent to previous report on La$$_{1.5}$$Sr$$_{0.5}$$CoO$$_{4}$$ were observed. However, we also observed an additional excitations with different zone center positions as well as excitation with higher spin-wave velocity. We expect detail analysis of present results can provide a key clue to understand the mechanism of complicated magnetic excitations caused by doped carrier, spin-orbital coupling and spins in transition metal oxides.

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