Matsuda, Shinya*; Ota, Joji*; Nakaima, Kenri*; Iha, Wataru*; Gochi, Jun*; Uwatoko, Yoshiya*; Nakashima, Miho*; Amako, Yasushi*; Honda, Fuminori*; Aoki, Dai*; et al.
Philosophical Magazine, 100(10), p.1244 - 1257, 2020/04
Onuki, Yoshichika*; Kakihana, Masashi*; Iha, Wataru*; Nakaima, Kenri*; Aoki, Dai*; Nakamura, Ai*; Honda, Fuminori*; Nakashima, Miho*; Amako, Yasushi*; Gochi, Jun*; et al.
JPS Conference Proceedings (Internet), 29, p.012001_1 - 012001_9, 2020/02
Koizumi, Akihisa*; Kubo, Yasunori*; Yamamoto, Etsuji; Haga, Yoshinori; Sakurai, Yoshiharu*
Journal of the Physical Society of Japan, 88(3), p.034714_1 - 034714_6, 2019/03
Matsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Aoki, Haruyoshi*; Kimura, Noriaki*; Yamamura, Tomoo*; Yamamoto, Etsuji; Matsuda, Tatsuma*; Fisk, Z.*; Yamagami, Hiroshi*
Journal of the Physical Society of Japan, 85(10), p.104709_1 - 104709_7, 2016/10
Kakihana, Masashi*; Teruya, Atsushi*; Nishimura, Kengo*; Nakamura, Ai*; Takeuchi, Tetsuya*; Haga, Yoshinori; Harima, Hisatomo*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 84(9), p.094711_1 - 094711_8, 2015/09
Matsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Aoki, Haruyoshi*; Kimura, Noriaki*; Matsuda, Tatsuma*; Yamamoto, Etsuji; Fisk, Z.; Yamagami, Hiroshi*
JPS Conference Proceedings (Internet), 3, p.011096_1 - 011096_5, 2014/06
Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo; Shishido, Hiroaki*; Settai, Rikio*; Harima, Hisatomo*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 74(12), p.3276 - 3282, 2005/12
We have succeeded in growing a high-quality single crystal of ThIn with the cubic structure by the In-flux method and measured the electrical resistivity, magnetic susceptibility and de Haas-van Alphen (dHvA) effect. Several dHvA branches were observed, ranging from 5.2 10 to 1.7 10 Oe. The Fermi surface consists of a nearly spherical Fermi surface and a multiply-connected Fermi surface with many but small extremal cross-sections. The corresponding cyclotron effective masses are small, ranging from 0.31 to 1.4 . These Fermi surface properties are well explained by the energy band calculations based on the FLAPW method.
Haga, Yoshinori; Aoki, Dai*; Yamagami, Hiroshi*; Matsuda, Tatsuma; Nakajima, Kunihisa; Arai, Yasuo; Yamamoto, Etsuji; Nakamura, Akio; Homma, Yoshiya*; Shiokawa, Yoshinobu; et al.
Journal of the Physical Society of Japan, 74(11), p.2889 - 2892, 2005/11
We observed for the first time the de Haas-van Alphen oscillation in a paramagnet PuIn. One detected dHvA branch named corresponds to a closed band-27 electron Fermi surface, where three kinds of closed Fermi surfaces are calculated on the basis of the 5-itinerant band model. The cyclotron mass of branch was determined as 4.8 . The dHvA signals are found to be extremely reduced as a function of time due to point defects produced by -decay of Pu.
Maehira, Takahiro; Hotta, Takashi; Ueda, Kazuo; Hasegawa, Akira*
Physical Review Letters, 90(20), p.207007_1 - 207007_4, 2003/05
By using a relativistic linear augmented-plane-wave method, we clarify energy band structures and Fermi surfaces of recently discovered plutonium-based superconductor PuCoGa. We find several cylindrical sheets of Fermi surfaces with large volume, quite similar to CeMIn (M=Ir and Co) isostructural with PuCoGa, in spite of different -electron numbers between Ce and Pu ions. This similarity is simply understood by a concept of electron-hole conversion in a tight binding model constructed based on the - coupling scheme. Due to the present results, we provide a possible scenario to explain why a transition temperature is so high as 18.5K in PuCoGa.
Maehira, Takahiro; Hotta, Takashi; Ueda, Kazuo; Hasegawa, Akira*
Journal of the Physical Society of Japan, 72(4), p.854 - 864, 2003/04
In order to investigate electronic properties of recently discovered heavy fermion superconductors CeTIn (T=Ir and Co), we employ the relativistic linear augmented-plane-wave (RLAPW) method to clarify the energy band structures and Fermi surfaces of those materials.The obtained energy bands mainly due to the large hybridization between Ce and In 5 states well reproduce the Fermi surfaces consistent with the de Haas-van Alphen experimental results. For the purpose, we construct a tight-binding model for CeTIn by including - and - hoppings as well as - hybridization, which are expressed by the Slater-Koster integrals, determined by the direct comparison with the band-calculation result. Similarity and difference between CeIrIn and CeCoIn are discussed based on the obtained tight-binding model, suggesting a significant importance of the effect of crystalline electric field to understand the difference in electronic properties among CeTIn.
Ikeda, Shugo; Tokiwa, Yoshifumi*; Haga, Yoshinori; Yamamoto, Etsuji; Okubo, Tomoyuki*; Yamada, Mineko*; Nakamura, Noriko*; Sugiyama, Kiyohiro*; Kindo, Koichi*; Inada, Yoshihiko*; et al.
Journal of the Physical Society of Japan, 72(3), p.576 - 581, 2003/03
no abstracts in English
Haga, Yoshinori; Yamamoto, Etsuji; Tokiwa, Yoshifumi; Aoki, Dai*; Inada, Yoshihiko*; Settai, Rikio*; Maehira, Takahiro; Yamagami, Hiroshi*; Harima, Hisatomo*; Onuki, Yoshichika
Journal of Nuclear Science and Technology, 39(Suppl.3), p.56 - 62, 2002/11
Fermi surfaces of uranium compounds are investigated by de Haas-van Alphen (dHvA) effect. Band calculations well reproduce the Fermi surfaces of non-magnetic itinerant systems such as USi, UC, UAl. Fermi surfaces of the heavy fermion compounds, where the strong correlation between carriers are important, are also explained by band calculations, except for their unusually large mass enhancement. We have also observed dHvA oscillations in the superconducting mixed states in heavy fermion superconductors such as URuSi, UPdAl and CeRu. A significan field dependence of cyclotron effective mass and scattering life time were observed.
Matsuda, Tatsuma; Abe, Keisuke*; Watanuki Fumihito*; Sugawara, Hitoshi*; Aoki, Yuji*; Sato, Hideyuki*; Inada, Yoshihiko*; Settai, Rikio*; Onuki, Yoshichika
Physica B; Condensed Matter, 312-313, p.832 - 833, 2002/03
The angular dependence of de Haas-van Alphen effect has been measured to reveal the electronic structure of filled skutterudite PrRuSb. The angular dependence of de Haas-van Alphen frequency of PrRuSb is in good agreement with that of LaRuSb. Compared with PrFeP, no anomalous enhancement of cyclotron effective mass has been observed in this system. This change of electronic structure is attributed to the difference in the hybridization strength, which is expected from the large difference in the lattice parameters.
no journal, ,