2 0 0 0 Large Cyclotron Mass and Large Ordered Moment in Ferromagnet CoS₂ Compared with Paramagnet CoSe₂
- 著者
- Teruya Atsushi Suzuki Fuminori Aoki Dai Honda Fuminori Nakamura Ai Nakashima Miho Amako Yasushi Harima Hisatomo Hedo Masato Nakama Takao Onuki Yoshichika
- 出版者
- The Physical Society of Japan
- 雑誌
- Journal of the Physical Society of Japan (ISSN:00319015)
- 巻号頁・発行日
- vol.85, no.6, pp.64716-1-10, 2016-06-01
- 被引用文献数
- 11
We succeeded in growing high-quality single crystals of the pyrite-type cubic compounds CoSe<sub>2</sub>and CoS<sub>2</sub>using the transport agent CoBr<sub>2</sub>and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization, and de Haas–van Alphen (dHvA) effect. We confirmed that CoSe<sub>2</sub>is an exchange-enhanced paramagnet revealing a broad maximum at around 50 K in the temperature dependence of the magnetic susceptibility. The electronic specific heat coefficient is moderately large, γ = 18 mJ/(K<sup>2</sup>·mol). On the other hand, CoS<sub>2</sub>is a ferromagnet with a Curie temperature <italic>T</italic><sub>C</sub>= 122 K and an ordered moment μ<sub>s</sub>= 0.93 μ<sub>B</sub>/Co. The γ of 21 mJ/(K<sup>2</sup>·mol) of CoS<sub>2</sub>is slightly larger than that of CoSe<sub>2</sub>. A large ordered moment, together with a large γ, is characteristic of CoS<sub>2</sub>because CoS<sub>2</sub>is a half-metallic spin state in the ferromagnetic state. Correspondingly, we detected a main dHvA branch with a large cyclotron effective mass of 13<italic>m</italic><sub>0</sub>in the dHvA experiments. The detected dHvA branches in CoS<sub>2</sub>and CoSe<sub>2</sub>are discussed on the basis of the results of energy band calculations, revealing a broken fourfold symmetry in the angular dependence of the dHvA frequency.
1 0 0 0 Large Cyclotron Mass and Large Ordered Moment in Ferromagnet CoS₂ Compared with Paramagnet CoSe₂
- 著者
- Teruya Atsushi Suzuki Fuminori Aoki Dai Honda Fuminori Nakamura Ai Nakashima Miho Amako Yasushi Harima Hisatomo Hedo Masato Nakama Takao Onuki Yoshichika
- 出版者
- The Physical Society of Japan
- 雑誌
- Journal of the Physical Society of Japan (ISSN:00319015)
- 巻号頁・発行日
- vol.85, no.6, pp.64716-1-10, 2016-06-01
- 被引用文献数
- 11
We succeeded in growing high-quality single crystals of the pyrite-type cubic compounds CoSe<sub>2</sub>and CoS<sub>2</sub>using the transport agent CoBr<sub>2</sub>and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization, and de Haas–van Alphen (dHvA) effect. We confirmed that CoSe<sub>2</sub>is an exchange-enhanced paramagnet revealing a broad maximum at around 50 K in the temperature dependence of the magnetic susceptibility. The electronic specific heat coefficient is moderately large, γ = 18 mJ/(K<sup>2</sup>·mol). On the other hand, CoS<sub>2</sub>is a ferromagnet with a Curie temperature <italic>T</italic><sub>C</sub>= 122 K and an ordered moment μ<sub>s</sub>= 0.93 μ<sub>B</sub>/Co. The γ of 21 mJ/(K<sup>2</sup>·mol) of CoS<sub>2</sub>is slightly larger than that of CoSe<sub>2</sub>. A large ordered moment, together with a large γ, is characteristic of CoS<sub>2</sub>because CoS<sub>2</sub>is a half-metallic spin state in the ferromagnetic state. Correspondingly, we detected a main dHvA branch with a large cyclotron effective mass of 13<italic>m</italic><sub>0</sub>in the dHvA experiments. The detected dHvA branches in CoS<sub>2</sub>and CoSe<sub>2</sub>are discussed on the basis of the results of energy band calculations, revealing a broken fourfold symmetry in the angular dependence of the dHvA frequency.
- 著者
- SUZUKI Shoji SATO Shigeru EJIMA Takeo MURATA Katsutoshi KUDO Yuji TAKAHASHI Takashi KOMATSUBARA Takemi SATO Noriaki KASAYA Mitsuo SUZUKI Takashi KASUYA Tadao SUGA Shigemasa MATSUBARA Hideki SAITO Yuji KIMURA Akiko SODA Kazuo ONUKI Yoshichika MORI Tamiko KAKIZAKI Akito ISHII Takehiko
- 出版者
- 社団法人応用物理学会
- 雑誌
- JJAP series (ISSN:09149090)
- 巻号頁・発行日
- vol.8, pp.59-80, 1993-01-31