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Journal Articles

Fermi surface, magnetic, and superconducting properties in actinide compounds

Onuki, Yoshichika; Settai, Rikio*; Haga, Yoshinori; Machida, Yo*; Izawa, Koichi*; Honda, Fuminori*; Aoki, Dai*

Comptes Rendus Physique, 15(7), p.616 - 629, 2014/08

https://doi.org/10.1016/j.crhy.2014.06.005
 Times Cited Count：6 Percentile：44.89(Astronomy & Astrophysics)

Journal Articles

Unique Fermi surface and emergence of charge density wave in EuGa$$_4$$ and EuAl$$_4$$

Nakamura, Ai*; Hiranaka, Yuichi*; Hedo, Masato*; Nakama, Takao*; Miura, Yasunao*; Tsutsumi, Hiroki*; Mori, Akinobu*; Ishida, Kazuhiro*; Mitamura, Katsuya*; Hirose, Yusuke*; et al.

JPS Conference Proceedings (Internet), 3, p.011012_1 - 011012_6, 2014/06

https://doi.org/10.7566/JPSCP.3.011012

Journal Articles

Electronic properties of transuranium compounds with HoCoGa$$_5$$-type tetragonal crystal structure

Maehira, Takahiro*; Hotta, Takashi; Ueda, Kazuo*; Hasegawa, Akira*

New Journal of Physics (Internet), 8(2), p.24_1 - 24_20, 2006/02

https://doi.org/10.1088/1367-2630/8/2/024
 Times Cited Count：16 Percentile：64.65(Physics, Multidisciplinary)

By using a relativistic band-structrue calculation method, we investigate energy band structures and the Fermi surfaces of NpTGa$$_5$$, PuTGa$$_5$$, and AmCoGa$$_5$$ with transition metal atoms T. It is found in common that the energy bands in the vicinity of the Fermi level are mainly due to the large hybridization between $$5f$$ and Ga $$4p$$ electrons. For PuTGa$$_5$$, we observe several cylindrical sheets of Fermi surfaces with large volume for T=Co, Rh, and Ir. It is also found that the Fermi surfaces of NpFeGa$$_5$$, NpCoGa$$_5$$, and NpNiGa$$_5$$ are similar to those of UCoGa$$_5$$, UNiGa$$_5$$, and PuCoGa$$_5$$, respectively, except for small details. For AmCoGa$$_5$$, the Fermi surfaces are found to consist of large cylindrical electron sheets and small closed hole sheets, similar to PuCoGa$$_5$$. The similarity is basically understood by a rigid-band picture.

Journal Articles

Itinerant 5$$f$$ electrons and the Fermi surface properties in an enhanced Pauli paramagnet NpGe$$_{3}$$

Aoki, Dai*; Yamagami, Hiroshi*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 74(8), p.2149 - 2152, 2005/08

https://doi.org/10.1143/JPSJ.74.2149
 Times Cited Count：25 Percentile：72.91(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Quasi-two-dimensional Fermi surfaces in the flat antiferromagnetic Brillouin zone of NpRhGa$$_{5}$$ studied by dHvA experiments and energy band calculations

Aoki, Dai*; Yamagami, Hiroshi*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika

Journal of Physics; Condensed Matter, 17(17), p.L169 - L175, 2005/05

https://doi.org/10.1088/0953-8984/17/17/L03
 Times Cited Count：43 Percentile：80.69(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Electronic structure and the fermi surface of UTGa$$_{5}$$ (T=Fe, Co, Rh)

Maehira, Takahiro; Higuchi, Masahiko*; Hasegawa, Akira*

Physica B; Condensed Matter, 329-333(1-4), p.574 - 575, 2003/05

https://doi.org/10.1016/S0921-4526(02)02450-X
 Times Cited Count：20 Percentile：66.97(Physics, Condensed Matter)

The relativistic energy-band calculations have been carried out for $${rm UFeGa_{5}}$$, $${rm UCoGa_{5}}$$ and $${rm URhGa_{5}}$$ under the assumption that 5$$f$$-electrons are itinerant. A hybridization between the U 5$$f$$ state and Ga 4$$p$$ state occurs in the vicinity of the Fermi level. The Fermi surface of $${rm UCoGa_{5}}$$ is quite similar to that of $${rm URhGa_{5}}$$, which are all small in size and closed in topology. $${rm UFeGa_{5}}$$ has the quasi-two-dimensional Fermi surface which looks like a lattice structure.

Journal Articles

Magnetic and Fermi surface properties of UTGa$$_{5}$$(T:Fe, Co and Pt)

Ikeda, Shugo; Tokiwa, Yoshifumi*; Okubo, Tomoyuki*; Yamada, Mineko*; Matsuda, Tatsuma; Inada, Yoshihiko*; Settai, Rikio*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 329-333(2), p.610 - 611, 2003/05

https://doi.org/10.1016/S0921-4526(02)02496-1
 Times Cited Count：13 Percentile：56.06(Physics, Condensed Matter)

no abstracts in English

JAEA Reports

Studies of formation structures of ultrafine Cu precipitates in Fe-Cu model alloys for reactor pressure vessel steels using positron quantum dot confinement in the precipitates by their positron affinity, JAERI's nuclear research promotion program, H13-034 (Contract research)

Hasegawa, Masayuki*; Nagai, Yasuyoshi*; Tang, Z.*; Yubuta, Kunio*; Suzuki, Masahide

JAERI-Tech 2003-015, 137 Pages, 2003/03

JAERI-Tech-2003-015.pdf:9.03MB

no abstracts in English

Journal Articles

Magnetic properties of UNiGa$$_{5}$$ and UPtGa$$_{5}$$

Tokiwa, Yoshifumi; Haga, Yoshinori; Metoki, Naoto; Nakamura, Akio; Ishii, Yoshinobu; Onuki, Yoshichika

Journal of Nuclear Science and Technology, 39(Suppl.3), p.210 - 213, 2002/11

https://doi.org/10.1080/00223131.2002.10875446

no abstracts in English

Journal Articles

Magnetic and Fermi surface properties of UPtGa$$_5$$

Tokiwa, Yoshifumi; Ikeda, Shugo*; Haga, Yoshinori; Okubo, Tomoyuki*; Iizuka, Tomoya*; Sugiyama, Kiyohiro*; Nakamura, Akio; Onuki, Yoshichika

Journal of the Physical Society of Japan, 71(3), p.845 - 851, 2002/03

https://doi.org/10.1143/JPSJ.71.845
 Times Cited Count：40 Percentile：81.14(Physics, Multidisciplinary)

We succeeded in growing a high-quality single crystal of an antiferromagnet UPtGa$$_5$$ by the self-flux method, and measured the magnetic susceptibility, electrical resistivity, specific heat and de Haas-van Alphen (dHvA) oscillation. We found an antiferromagnetic transition at 26K from the magnetic susceptibility and electrical resistivity measurements. Six dHvA branches were observed, ranging from 1.14$$times$$10$$^7$$ to 1.13$$times$$10$$^8$$ Oe. Fermi surfaces consist of two nearly cylindrical and two spherical Fermi surfaces. The cyclotron mass is large, ranging from 10 to 24 $$m_{rm 0}$$, which is consistent with the electronic specific heat coefficient $$gamma$$ = 57 mJ/K$$^2cdot$$mol.

Journal Articles

Electronic structure and the Fermi surface of UBe$$_{13}$$

Maehira, Takahiro; Higashitani, Atsushi*; Higuchi, Masahiko*; Yasuhara, Hiroshi*; Hasegawa, Akira*

Physica B; Condensed Matter, 312-313(1-4), p.103 - 105, 2002/03

https://doi.org/10.1016/S0921-4526(01)01073-0
 Times Cited Count：12 Percentile：53.21(Physics, Condensed Matter)

UBe$$_{13}$$ is a typical heavy-fermion superconductor compound. The lowtemperature electronic specific heat coefficient has the anomalous large value, $$gamma_{exp}$$=1.1J/K$$^2$$mol, which is the largest among the heavy fermion uranium compounds. It also becomes the superconductor below T$$_C$$=0.85K. Therefore, UBe$$_{13}$$ is an important material as a strongly correlated electron system, and it is necessary to study from both sides of the theory and the experiment. The measurement suggests that the Fermi surface of UBe$$_{13}$$ may consist of small sheets. The energy band structure and the Fermi surface for UBe$$_{13}$$ are calculated by the relativistic linear APW method.

Journal Articles

Fermi surface of heavy Fermion compounds CeTIn$$_5$$ (T=Rh, Ir, and Co); Band-calculation and tight-binding approach

Maehira, Takahiro; Takimoto, Tetsuya; Hotta, Takashi; Ueda, Kazuo*; Higuchi, Masahiko*; Hasegawa, Akira*

Journal of the Physical Society of Japan, Vol.71, Supplement, p.285 - 287, 2002/00

https://doi.org/10.1143/JPSJS.71S.285
 Times Cited Count：8 Percentile：49.91(Physics, Multidisciplinary)

Recently a new family of Ce-based heavy fermion superconductor $${rm CeTIn_{5}}$$ (T=Rh, Ir, and Co) has been reported. The dHvA effect has been successfully observed in $${rm CeIrIn_{5}}$$ and $${rm CeCoIn_{5}}$$.The angular dependence of dHvA branches is well explained by a quasi-two dimensional Fermi surface(F.S.). In order to clarify band structures of Ce-115 systems such as CeIrIn$$_5$$ and CeCoGa$$_5$$, two-step strategy is here employed. In the first step, the F.S. are derived by using the RLAPW method. In the next step, the band structure near the Fermi level is reanalyzed by using a simple tight-binding model. Namely, hopping amplitudes of $$f$$-electrons between neighboring Ce ions are parameterized to reproduce the F.S. obtained in the band-calculation. By further adding the Coulomb interaction terms into this tight-binding model, a simple many-body Hamiltonian for Ce-compounds can be constructed. This Hamiltonian opens a way to discuss magnetism and superconductivity in $$f$$-electron systems from the microscopic viewpoint.

Journal Articles

De Haas-van Alphen effect and Fermi surface in UC

Yamamoto, Etsuji; Haga, Yoshinori; Maehira, Takahiro*; Inada, Yoshihiko*; Murakawa, Masao*; Onuki, Yoshichika; Hasegawa, Akira*

Journal of Magnetism and Magnetic Materials, 226-230(Part.1), p.51 - 53, 2001/05

no abstracts in English

Journal Articles

$$^{238}$$U M$"o$ssbauer spectroscopic study of UX$$_{2}$$(X=Ga, P, As, Sb)

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Homma, Tetsuo; Yamamoto, Etsuji; Tokiwa, Yoshifumi; Aoki, Dai*; Wi$'s$niewski, P.*; Onuki, Yoshichika

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.34 - 36, 2001/05

no abstracts in English

Journal Articles

Electronic structure and the Fermi surface of UC and UGe$$_{3}$$

Maehira, Takahiro; Higuchi, Masahiko*; Yamamoto, Etsuji; Onuki, Yoshichika; Hasegawa, Akira*

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.43 - 45, 2001/05

no abstracts in English

Journal Articles

Fermi surface of UB$$_{4}$$ studied by the de Haas-van Alphen oscillation and magnetoresistance experiments

Yamamoto, Etsuji; Homma, Tetsuo; Haga, Yoshinori; Inada, Yoshihiko*; Aoki, Dai*; Tokiwa, Yoshifumi; Suzuki, N.*; Miyake, Kosaku*; Onuki, Yoshichika

Physica B; Condensed Matter, 281-282, p.767 - 768, 2000/06

https://doi.org/10.1016/S0921-4526(99)01096-0
 Times Cited Count：1 Percentile：8.61(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetoresistnace and de Haas-van Alphen effect in UB$$_{4}$$

Yamamoto, Etsuji; Homma, Tetsuo; Haga, Yoshinori; Inada, Yoshihiko*; Aoki, Dai*; Tokiwa, Yoshifumi; Suzuki, N.*; Miyake, Kosaku*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 68(10), p.3347 - 3351, 1999/00

https://doi.org/10.1143/JPSJ.68.3347
 Times Cited Count：5 Percentile：44.14(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Fermi surface of UB$$_{2}$$ studied by the de Haas-van Alphen oscillation

Yamamoto, Etsuji; Homma, Tetsuo*; Haga, Yoshinori; Inada, Yoshihiko*; Aoki, Dai*; *; *; Yamagami, Hiroshi*; Onuki, Yoshichika*

Physica B; Condensed Matter, 259-261, p.1085 - 1086, 1999/00

https://doi.org/10.1016/S0921-4526(98)01085-0
 Times Cited Count：3 Percentile：22.84(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Fermi surfaces and local curvature factors of Ce compounds with cubic laves phase structure

Higuchi, Masahiko; Onuki, Yoshichika*; Hasegawa, Akira*

Physica B; Condensed Matter, 230-232, p.486 - 489, 1997/02

https://doi.org/10.1016/S0921-4526(96)00622-9
 Times Cited Count：1 Percentile：11.83(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Fermi surface of CeRu$$_{2}$$ within local-density functional theory

Higuchi, Masahiko*; *

Journal of the Physical Society of Japan, 65(5), p.1302 - 1311, 1996/05

https://doi.org/10.1143/JPSJ.65.1302
 Times Cited Count：25 Percentile：78.35(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

De Haas-van Alphen effect in AnRh$$_6$$Ge$$_4$$ (An = Th, U)

Haga, Yoshinori; Tateiwa, Naoyuki; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Yamagami, Hiroshi; Matsumoto, Yuji*; Yamamura, Tomoo*

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)