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論文

First observation of the de Haas-van Alphen effect and Fermi surfaces in the unconventional superconductor UTe$$_2$$

青木 大*; 酒井 宏典; Opletal, P.; 常盤 欣文; 石塚 淳*; 柳瀬 陽一*; 播磨 尚朝*; 仲村 愛*; Li, D.*; 本間 佳哉*; et al.

Journal of the Physical Society of Japan, 91(8), p.083704_1 - 083704_5, 2022/08

https://doi.org/10.7566/JPSJ.91.083704
 被引用回数：22 パーセンタイル：96.09(Physics, Multidisciplinary)

de Haas-van Alphen oscillation was successfully observed in an unconventional superconductor UTe$$_2$$ using high-quality single crystals. From this observation, Fermi surfaces of this compound were determined to be cylinders elongated along the c-direction, in consistent with theoretical expectation. However, the extremely large cyclotron effective masses ranging 32 to 57 m$$_0$$, in consistent with the electronic specific heat, far exceed calculated values.

論文

Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe$$_2$$

芳賀 芳範; Opletal, P.; 常盤 欣文; 山本 悦嗣; 徳永 陽; 神戸 振作; 酒井 宏典

Journal of Physics; Condensed Matter, 34(17), p.175601_1 - 175601_7, 2022/04

https://doi.org/10.1088/1361-648X/ac5201
 被引用回数：17 パーセンタイル：89.44(Physics, Condensed Matter)

Single crystals of the unconventional superconductor UTe$$_2$$ have been grown in various conditions. Superconducting samples are nearly stoichiometric within an experimental error of about 1%, while non-superconducting sample significantly deviates from the ideal composition. The superconducting UTe$$_2$$ showed that the large density of states was partially gapped in the normal state, while the non-superconducting sample is characterized by the relatively large electronic specific heat as reported previously.

論文

Electronic structure of ThPd$$_2$$Al$$_3$$; Impact of the U $$5f$$ states on the electronic structure of UPd$$_2$$Al$$_3$$

藤森 伸一; 竹田 幸治; 山上 浩志; Posp$'i$$v{s}$il, J.*; 山本 悦嗣; 芳賀 芳範

Physical Review B, 105(11), p.115128_1 - 115128_6, 2022/03

https://doi.org/10.1103/PhysRevB.105.115128
 被引用回数：0 パーセンタイル：0(Materials Science, Multidisciplinary)

The electronic structure of $$mathrm{ThPd_2Al_3}$$, which is isostructural to the heavy fermion superconductor $$mathrm{UPd_2 Al_3}$$, was investigated by photoelectron spectroscopy. The band structure and Fermi surfaces of $$mathrm{ThPd_2Al_3}$$ were obtained by angle-resolved photoelectron spectroscopy (ARPES), and the results were well-explained by the band-structure calculation based on the local density approximation. The comparison between the ARPES spectra and the band-structure calculation suggests that the Fermi surface of $$mathrm{ThPd_2Al_3}$$ mainly consists of the $$mathrm{Al}~3p$$ and $$mathrm{Th}~6d$$ states with a minor contribution from the $$mathrm{Pd}~4d$$ states. The comparison of the band structures between $$mathrm{ThPd_2Al_3}$$ and $$mathrm{UPd_2Al_3}$$ argues that the $$mathrm{U}~5f$$ states form Fermi surfaces in $$mathrm{UPd_2Al_3}$$ through hybridization with the $$mathrm{Al}~3p$$ state in the $$mathrm{Al}$$ layer, suggesting that the Fermi surface of $$mathrm{UPd_2Al_3}$$ has a strong three-dimensional nature.

論文

Anisotropic physical properties of layered antiferromagnet U$$_2$$Pt$$_6$$Ga$$_{15}$$

松本 裕司*; 芳賀 芳範; 山本 悦嗣; 竹内 徹也*; 三宅 厚志*; 徳永 将史*

Journal of the Physical Society of Japan, 90(7), p.074707_1 - 074707_6, 2021/07

https://doi.org/10.7566/JPSJ.90.074707
 被引用回数：0 パーセンタイル：0(Physics, Multidisciplinary)

A uranium intermetallic compound U$$_2$$Pt$$_6$$Ga$$_{15}$$ was successfully synthesized. This compound crystallizes in the hexagonal Sc$$_{0.6}$$Fe$$_2$$Si$$_{4.9}$$-type structure. Antiferromagnetic transition with highly magnetic anisotropy was established by the physical property measurements.

論文

Intriguing behavior of UCo$$_{1-x}$$Rh$$_x$$Ge ferromagnets in magnetic field along the $$b$$ axis

Posp$'i$$v{s}$il, J.*; 芳賀 芳範; 三宅 厚志*; 神戸 振作; 徳永 陽; 徳永 将史*; 山本 悦嗣; Proschek, P.*; Voln$'y$, J.*; Sechovsk$'y$, V.*

Physical Review B, 102(2), p.024442_1 - 024442_13, 2020/07

https://doi.org/10.1103/PhysRevB.102.024442
 被引用回数：6 パーセンタイル：38.95(Materials Science, Multidisciplinary)

Alloying study of ferromagnetic superconductors URhGe and UCoGe is reported. The Curie temperature shows a maximum at Rh concentration $$x$$ = 0.4 in UCo$$_{1-x}$$Rh$$_x$$Ge. Magnetic characteristices in low- and high-$$x$$ regions are significantly different each other. The relationship between magnetism and superconductivity are discussed.

論文

Structural characterization and magnetic behavior of uranium compound U$$_2$$Pt$$_6$$Al$$_{15}$$

芳賀 芳範; 菅井 孝志*; 松本 裕司*; 山本 悦嗣

JPS Conference Proceedings (Internet), 29, p.013003_1 - 013003_5, 2020/02

https://doi.org/10.7566/JPSCP.29.013003

Crystal structure and magnetic property of U$$_2$$Pt$$_6$$Al$$_{15}$$ is investigated. A single crystal X-ray diffraction experiment identified the hexagonal unit cell with a disordered structure in the uranium containing layer. A series of superstructure reflections were found. They are successfully indexed as ($$h$$/3 $$k$$/3 0), however, with a streak along the $$l$$ direction. A layered structure model containing honeycomb arrangement of uranium atoms is proposed. Preliminary magnetization measurements on a polycrystalline sample are also presented.

論文

Magnetization study on the Ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis

中村 翔太*; 榊原 俊郎*; 清水 悠晴*; 橘高 俊一郎*; 河野 洋平*; 芳賀 芳範; Pospisil, J.; 山本 悦嗣

Progress in Nuclear Science and Technology (Internet), 5, p.123 - 127, 2018/11

https://doi.org/10.15669/pnst.5.123

Dc magnetization measurements have been performed on the orthorhombic Ising ferromagnet Urge. We observed a clear first-order reorientation transition with a small hysteresis and estimated the tricritical point to be around 4 K. The magnetization and the thermal expansion data indicate the presence of a characteristic temperature of about 1 K.

論文

Anomalous Hall effect in a triangular-lattice antiferromagnet UNi$$_4$$B

小山田 明*; 猪原 崇生*; 山本 悦嗣; 芳賀 芳範

Progress in Nuclear Science and Technology (Internet), 5, p.128 - 131, 2018/11

https://doi.org/10.15669/pnst.5.128

We report the Hall effect measurements on a triangular-lattice antiferromagnet UNi$$_4$$B in the context of the proposed relevance of the ferroic order. Our measurements show that the Hall voltage is proportional to the square of the electric current and its coefficient increases significantly below the transition temperature, which supports the theoretical prediction.

論文

Crystal structure and magnetic properties of new ternary uranium compound U$$_3$$TiBi$$_9$$

本山 岳*; 芳賀 芳範; 山口 明*; 川崎 郁斗*; 住山 昭彦*; 山村 朝雄*

Progress in Nuclear Science and Technology (Internet), 5, p.157 - 160, 2018/11

https://doi.org/10.15669/pnst.5.157

The crystal structure of the newly discovered compound U$$_3$$TiBi$$_9$$ was determined from single-crystal X-ray diffraction data. This compound shows an antiferromagnetic ordering at 31.5 K. A clear anomaly was observed at the transition temperature on the temperature dependence of magnetic susceptibility and electrical resistivity.

論文

Crystallographic, magnetic, thermal, and electric transport properties in UPtIn single crystal

松本 裕司*; 芳賀 芳範; 立岩 尚之; 山本 悦嗣; Fisk, Z.*

Journal of the Physical Society of Japan, 87(2), p.024706_1 - 024706_4, 2018/02

https://doi.org/10.7566/JPSJ.87.024706
 被引用回数：0 パーセンタイル：0(Physics, Multidisciplinary)

Single crystal samples of UPtIn with the hexagonal structure are grown from indium flux. Strong uniaxial magnetic anisotropy is revealed from magnetic property measurements. Specific heat measurement reveals a significant deviation from $$T$$-linear behavior, indicating the smaller electronic specific heat than the previous study.

論文

Effect of pressure on magnetism of UIrGe

Pospisil, J.; 郷地 順*; 芳賀 芳範; 本多 史憲*; 上床 美也*; 立岩 尚之; 神戸 振作; 長崎 尚子*; 本間 佳哉*; 山本 悦嗣

Journal of the Physical Society of Japan, 86(4), p.044709_1 - 044709_6, 2017/04

https://doi.org/10.7566/JPSJ.86.044709
 被引用回数：9 パーセンタイル：56.98(Physics, Multidisciplinary)

The effect of hydrostatic pressure on the electronic state of the antiferromagnet UIrGe is reported. A series of resistivity measurements up to 15 GPa demonstrated the Neel temperature decreases with increasing pressure and vanishes around 12 GPa. The transition from antiferromagnetic to paramagnetic phase appears to be of first order. A moderate increase in the effective mass was detected in the vicinity of the critical pressure.

論文

Switching of magnetic ground states across the UIr$$_{1-x}$$Rh$$_x$$Ge alloy system

Pospisil, J.; 芳賀 芳範; 神戸 振作; 徳永 陽; 立岩 尚之; 青木 大*; 本多 史憲*; 仲村 愛*; 本間 佳哉*; 山本 悦嗣; et al.

Physical Review B, 95(15), p.155138_1 - 155138_15, 2017/04

https://doi.org/10.1103/PhysRevB.95.155138
 被引用回数：14 パーセンタイル：56.08(Materials Science, Multidisciplinary)

We investigated the evolution of magnetism in UIr$$_{1-x}$$Rh$$_x$$Ge system by systematic study on high-quality single crystals. We find a field-induced first order transition in the vicinity of the critical magnetic field along the $$b$$ axis in the entire UIr$$_{1-x}$$Rh$$_x$$Ge system, including the ferromagnetic region.

論文

Crossover phase diagram and electronic state in the heavy-fermion metamagnets UIr$$_2$$Zn$$_{20}$$ and UCo$$_2$$Zn$$_{20}$$

広瀬 雄介*; 竹内 徹也*; 本多 史憲*; 吉内 伸吾*; 萩原 政幸*; 山本 悦嗣; 芳賀 芳範; 摂待 力生*; 大貫 惇睦

Journal of the Physical Society of Japan, 84(7), p.074704_1 - 074704_10, 2015/07

https://doi.org/10.7566/JPSJ.84.074704
 被引用回数：6 パーセンタイル：45.25(Physics, Multidisciplinary)

Magnetic phase diagram of two heavy fermion metamagnets UIr$$_2$$Zn$$_{20}$$ and UCo$$_2$$Zn$$_{20}$$ is investigated. UIr$$_2$$Zn$$_{20}$$ shows a reconstruction of the electronic states across the metamagnetic crossover. However, UCo$$_2$$Zn$$_{20}$$ shows a rather continuous evolution. The remarkable difference in both compounds can be accounted for by different degree of hybridization between 5$$f$$ and ligand electrons.

論文

Magnetic and electronic properties of URu$$_2$$Si$$_2$$ revealed by comparison with nonmagnetic references ThRu$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$

江見 直哉*; 濱端 良輔*; 中山 大将*; 三木 俊宙*; 小山 岳秀*; 上田 光一*; 水戸 毅*; 小堀 洋*; 松本 裕司*; 芳賀 芳範; et al.

Journal of the Physical Society of Japan, 84(6), p.063702_1 - 063702_4, 2015/06

https://doi.org/10.7566/JPSJ.84.063702
 被引用回数：10 パーセンタイル：58.48(Physics, Multidisciplinary)

NMR/NQR measurements have been carried out on ThRu$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$ which are the nonmagnetic references of the heavy fermion URu$$_2$$Si$$_2$$. Ru-NQR measurements suggest the relatively close electronic configuration between ThRu$$_2$$Si$$_2$$ and URu$$_2$$Si$$_2$$ at high temperature. However, significant delocalization was observed in URu$$_2$$Si$$_2$$ at low temperatures. Si-NMR experiments on URu$$_2$$Si$$_2$$ revealed Ising-like spin fluctuations in the hidden-order state.

論文

Resonant magnetic X-ray scattering study of UPd$$_2$$Al$$_3$$

石井 賢司; 葛下 かおり; 村上 洋一; 芳賀 芳範; 山本 悦嗣; 大貫 惇睦

Journal of the Physical Society of Japan, 75(Suppl.), p.102 - 104, 2006/08

UPd$$_2$$Al$$_3$$は$$T_N$$=14.5K以下で生じる反強磁性秩序と$$T_c$$=2K以下での超伝導が共存する興味深い物質である。共鳴X線磁気散乱により磁性と超伝導の結合を議論するためにも、$$T_c$$を越える実験の前に、それぞれの吸収端での共鳴の性質を知っておく必要がある。そのために、われわれは$$T_c < T < T_N$$においてUの$$M_1$$から$$M_4$$吸収端までの吸収端での共鳴X線磁気散乱の測定を行った。$$M_4$$吸収端での非常に大きな共鳴に加えて、$$3p_{1/2}$$から$$6d$$への遷移に対応する$$M_2$$吸収端でも共鳴が観測された。一方、$$M_1$$及び$$M_3$$吸収端での共鳴は小さいものであった。

論文

High-temperature magnetic investigations on uranium compounds

Galatanu, A.; 芳賀 芳範; 松田 達磨; 池田 修悟; 山本 悦嗣; 青木 大*; 竹内 徹也*; 大貫 惇睦

Journal of the Physical Society of Japan, 74(5), p.1582 - 1597, 2005/05

https://doi.org/10.1143/JPSJ.74.1582
 被引用回数：38 パーセンタイル：80.04(Physics, Multidisciplinary)

これまでわれわれが育成したウラン化合物について、温度800Kまでの高温磁化率測定を行った。これらの磁化率測定の結果から、ウラン化合物では5f電子状態が局在的なものからパウリ常磁性的なものまで極めて幅広い磁性がみられるが、室温以上の十分高温では、局在的なキュリーワイス則に従う振舞いに、ほとんどの物質が回復することが明らかになった。セリウム化合物と比べると、局在的な振舞いは比較的高温であることも明らかとなった。

報告書

溶液系からのウラン及びネプツニウム化合物合成法

佐伯 正克

JAERI-Review 2003-030, 50 Pages, 2003/11

JAERI-Review-2003-030.pdf:3.41MB

本総説は、溶液系から合成可能なウラン及びネプツニウムの化合物を中心に、その合成法と性質についてまとめたものである。ウランに関しては、3価の化合物3種類,4価の化合物4種類,6価の化合物23種類についてやや詳しく述べた。ネプツニウムに関しては、5価及び6価の貯蔵液の調整法,3価の化合物4項目(6種類),4価の化合物8項目(19種類),5価の化合物28項目(29種類),6価の化合物10項目(14種類)及び7価の化合物5項目(9種類)についてやや詳しく述べた。 また、詳しく記述できなかった化合物については、第5章に化合物名を列挙し、参考文献を示した。ここで用いた資料は、ウラン及びネプツニウム化合物の物性を、主な研究手段としてメスバウア分光法を用いて調べる研究活動過程で集積したものである。そこで、最後にアクチノイドのメスバウア分光法に関する総説類を列挙した。

論文

Fermi surface study in uranium-based intermetallic compounds

芳賀 芳範; 山本 悦嗣; 常盤 欣文; 青木 大*; 稲田 佳彦*; 摂待 力生*; 眞榮平 孝裕; 山上 浩志*; 播磨 尚朝*; 大貫 惇睦

Journal of Nuclear Science and Technology, 39(Suppl.3), p.56 - 62, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875408

ウラン化合物のフェルミ面をドハース・ファンアルフェン(dHvA)効果を用いて研究した。磁気秩序を持たない、遍歴5f物質USi$$_{3}$$, UC, UAl$$_{3}$$の実験結果は、バンド理論で極めてよく説明できる。他方、伝導電子間の相関が強い重い電子系でもバンド理論が摘要可能であることがわかってきた。ただし、巨大な有効質量はバンド理論では説明できない。また、重い電子系超伝導体URu$$_{2}$$Si$$_{2}$$, UPd$$_{2}$$Al$$_{3}$$, CeRu$$_{2}$$で、超伝導混合状態におけるdHvA振動の観測に成功し、有効質量及び散乱緩和時間の顕著な磁場依存性を観測した。

論文

The Effect of organic substitutes and structure of organophosphorus compounds on their extraction abilities for uranium

野村 真三; 原 礼之助

Analytica Chimica Acta, 25(3), p.212 - 218, 1961/00

https://doi.org/10.1016/0003-2670(61)80148-7
 被引用回数：41

抄録なし

口頭

Magnetocrystalline anisotropy of UIrGe compound

Pospisil, J.; 郷地 順*; 芳賀 芳範; 立岩 尚之; 山本 悦嗣; 徳永 陽; 神戸 振作

no journal, , 

UIrGe is an antiferromagnet crystallizing in the same orthorhombic structure as the ferromagnetic superconductors UCoGe and URhGe. We have studied physical properties on single crystal samples. Antifferomagnetic transition at 16.5 K was clearly observed, in consistent with the previous study. However, the results of electrical resistivity measurements obtained for our relatively high quality sample differ significantly from the previous reports, suggesting that the transport properties are significantly affected by the sample quality.

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