JAEA
  • help
  • PC | SP
  • JP | EN
          
検索対象：     
報告書番号：
※ 半角英数字
 年 ～ 
 年
全てクリア
検索結果：　31 件中 1件目～20件目を表示

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

使用言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

Field-induced insulator-metal transition in EuTe$$_2$$

竹内 徹也*; 本多 史憲*; 青木 大*; 芳賀 芳範; 木田 孝則*; 鳴海 康雄*; 萩原 政幸*; 金道 浩一*; 軽部 皓介*; 播磨 尚朝*; et al.

Journal of the Physical Society of Japan, 93(4), p.044708_1 - 044708_10, 2024/04

https://doi.org/10.7566/JPSJ.93.044708
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

Electrical and magnetic properties of divalent europium antiferromagnet EuTe$$_2$$ are studied on single crystals grown from Te-flux method. Antiferromagnetism occurs at 11 K with an insulating ground state. Application of magnetic field induces a sudden resistance drop leading to a phase transition to metallic state. Energy band calculations reveal the appearance of a Fermi surface pocket with Te-5p character induced by the polarized Eu moments.

論文

Antiferromagnetic films and their applications

廣畑 貴文*; Lloyd, D. C.*; 窪田 崇秀*; 関 剛斎*; 高梨 弘毅; 介川 裕章*; Wen, Z.*; 三谷 誠司*; 小泉 洸生*

IEEE Access, 11, p.117443 - 117459, 2023/10

https://doi.org/10.1109/ACCESS.2023.3326448
 被引用回数：2 パーセンタイル：19.73(Computer Science, Information Systems)

Spintronic devices are expected to replace the recent nanoelectronic memories and sensors due to their efficiency in energy consumption and functionality with scalability. To date, spintronic devices, namely magnetoresistive junctions, employ ferromagnetic materials by storing information bits as their magnetization directions. However, in order to achieve further miniaturization with maintaining and/or improving their efficiency and functionality, new materials development is required: 1) increase in spin polarization of a ferromagnet or 2) replacement of a ferromagnet by an antiferromagnet. Antiferromagnetic materials have been used to induce an exchange bias to the neighboring ferromagnet but they have recently been found to demonstrate a 100% spin-polarized electrical current, up to THz oscillation and topological effects. In this review, the recent development of three types of antiferromagnets is summarized with offering their future perspectives towards device applications.

論文

Characteristic Fermi surface properties in $$f$$-electron systems

大貫 惇睦*; 摂待 力生*; 芳賀 芳範; 竹内 徹也*; 辺土 正人*; 仲間 隆男*

Quantum Science; The Frontier of Physics and Chemistry, p.21 - 63, 2022/10

https://doi.org/10.1007/978-981-19-4421-5_2

Fermi surfaces of $$f$$-electron systems and the novel physical properties related with crystal symmetry, electronic correlations and magnetic interactions are reviewed. The key materials are CeRhIn$$_5$$, CeIr$$_3$$, EuCu$$_2$$Ge$$_2$$ and EuPtSi.

論文

Single crystal growth and magnetic properties of noncentrosymmetric antiferromagnet Mn$$_3$$IrSi

大貫 惇睦*; 金子 良夫*; 青木 大*; 仲村 愛*; 松田 達磨*; 中島 美帆*; 芳賀 芳範; 竹内 徹也*

Journal of the Physical Society of Japan, 91(6), p.065002_1 - 065002_2, 2022/06

https://doi.org/10.7566/JPSJ.91.065002
 被引用回数：2 パーセンタイル：30.92(Physics, Multidisciplinary)

Single crystals of Mn$$_3$$IrSi were grown using Bridgman method. Mn$$_3$$IrSi shows a remarkable increase of the electrical resistivity below antiferromagnetic transition temperature accompanied by a large jump of specific heat.

論文

Abrupt change in electronic states under pressure in new compound EuPt$$_3$$Al$$_5$$

小泉 尭嗣*; 本多 史憲*; 佐藤 芳樹*; Li, D.*; 青木 大*; 芳賀 芳範; 郷地 順*; 長崎 尚子*; 上床 美也*; 金子 良夫*; et al.

Journal of the Physical Society of Japan, 91(4), p.043704_1 - 043704_5, 2022/04

https://doi.org/10.7566/JPSJ.91.043704
 被引用回数：6 パーセンタイル：57.42(Physics, Multidisciplinary)

A new ternary europium compound EuPt$$_3$$Al$$_5$$ is reported. It orders antiferromagnetically at 12.4 K. Application of hydrostatic pressure varies the transition temperature and the compound becomes non-magnetic above the critical pressure 9 GPa. The pressure-temperature phase diagram is indicative of a possible valence crossover at the critical pressure.

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：1 パーセンタイル：12.51(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

Nonmagnetic-magnetic transition and magnetically ordered structure in SmS

吉田 章吾*; 小山 岳秀*; 山田 陽彦*; 中井 祐介*; 上田 光一*; 水戸 毅*; 北川 健太郎*; 芳賀 芳範

Physical Review B, 103(15), p.155153_1 - 155153_5, 2021/04

https://doi.org/10.1103/PhysRevB.103.155153
 被引用回数：1 パーセンタイル：5.15(Materials Science, Multidisciplinary)

SmS, a protopypical intermediate valence compound, has been studied by performing high-pressure nuclear magnetic resonance measurements. The observation of an additional signal at high pressure gives evidence of a magnetic phase transition. The cancellation of the hyperfined fields at the S site suggests a type-II antiferromagnetic structure.

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

Heavy fermion state of YbNi$$_2$$Si$$_3$$ without local inversion symmetry

中村 翔太*; 兵頭 一志*; 松本 裕司*; 芳賀 芳範; 佐藤 仁*; 上田 茂典*; 三村 功次郎*; 斉木 克祥*; 磯 孝斉*; 山下 穣*; et al.

Journal of the Physical Society of Japan, 89(2), p.024705_1 - 024705_5, 2020/02

https://doi.org/10.7566/JPSJ.89.024705
 被引用回数：2 パーセンタイル：18.65(Physics, Multidisciplinary)

We have succeeded in growing a new heavy fermion compound YbNi$$_2$$Si$$_3$$ by the flux method. From electrical resistivity, magnetization, specific heat, magnetic torque and X-ray photoemission measurements concluded that this compound is a heavy fermion compound exhibiting an antiferromagnetic order at 0.35 K.

論文

Magnetic and electrical properties of the ternary compound U$$_2$$Ir$$_3$$Si$$_5$$ with one-dimensional uranium zigzag chains

Li, D. X.*; 本多 史憲*; 三宅 厚志*; 本間 佳哉*; 芳賀 芳範; 仲村 愛*; 清水 悠晴*; Maurya, A.*; 佐藤 芳樹*; 徳永 将史*; et al.

Physical Review B, 99(5), p.054408_1 - 054408_9, 2019/02

https://doi.org/10.1103/PhysRevB.99.054408
 被引用回数：7 パーセンタイル：32.66(Materials Science, Multidisciplinary)

Physical properties of the single-crystalline U$$_2$$Ir$$_3$$Si$$_5$$, a new ternary uranium compound with U$$_2$$Co$$_3$$Si$$_5$$-type orthorhombic structure, are investigated by means of magnetic susceptibility, specific heat and electrical resistivity. This compound undergoes an antiferromagnetic transition followed by a first-order phase transition at lower temperature. A possible mechanism of the first-order transition is the occurrence of a magnetic magnetic quadrupolar order, resulting from the quasi-one-dimensional uranium zigzag chain.

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

Effects of magnetic field and pressure on the valence-fluctuating antiferromagnetic compound EuPt$$_2$$Si$$_2$$

竹内 徹也*; 屋良 朝之*; 安次富 洋介*; 伊覇 航*; 垣花 将司*; 中島 美帆*; 天児 寧*; 本多 史憲*; 本間 佳哉*; 青木 大*; et al.

Journal of the Physical Society of Japan, 87(7), p.074709_1 - 074709_14, 2018/07

https://doi.org/10.7566/JPSJ.87.074709
 被引用回数：13 パーセンタイル：63.80(Physics, Multidisciplinary)

Effects of magnetic field and pressure on the Kondo-like behavior in the valence-fluctuating antiferromagnetic compound EuPt$$_2$$Si$$_2$$ were studied using single-crystalline samples. Anomalous features in EuPt$$_2$$Si$$_2$$ are due to valence fluctuation and/or valence change of the Eu ions at low temperatures.

論文

Magnetic field induced phenomena in UIrGe in fields applied along the $$b$$ axis

Posp$'i$$v{s}$il, J.*; 芳賀 芳範; 小濱 芳允*; 三宅 厚志*; 神戸 振作; 立岩 尚之; Vali$v{s}$ka, M.*; Proschek, P.*; Prokle$v{s}$ka, J.*; Sechovsk$'y$, V.*; et al.

Physical Review B, 98(1), p.014430_1 - 014430_7, 2018/07

https://doi.org/10.1103/PhysRevB.98.014430
 被引用回数：16 パーセンタイル：57.38(Materials Science, Multidisciplinary)

The metamagnetic transition between the antiferromagnetic and paramagnetic state in UIrGe has been studied at various temperatures by magnetization, heat capacity, and magnetocaloric effect measurements on a single crystal in static and pulsed magnetic fields applied along the orthorhombic $$b$$ axis. The first-order transition is accompanied by a dramatic increase of the Sommerfeld coefficient. A tentative scenario explaining these anomalies by antiferromagnetic correlations or short-range order in the paramagnetic state is discussed.

論文

Electronic states in EuCu$$_2$$(Ge$$_{1-x}$$Si$$_x$$)$$_2$$ based on the doniach phase diagram

伊覇 航*; 屋良 朝之*; 安次富 洋介*; 垣花 将司*; 竹内 徹也*; 本多 史憲*; 仲村 愛*; 青木 大*; 郷地 順*; 上床 美也*; et al.

Journal of the Physical Society of Japan, 87(6), p.064706_1 - 064706_14, 2018/06

https://doi.org/10.7566/JPSJ.87.064706
 被引用回数：19 パーセンタイル：72.66(Physics, Multidisciplinary)

We succeeded in growing single crystals of the series of EuCu$$_2$$(Ge$$_{1-x}$$Si$$_x$$)$$_2$$ compounds.Physical property measurements demonstrate a maximum of the antiferromagnetic transition temperature appears at $$x = 0.5$$. Antiferromagnetism then disappears around $$x = 0.7$$ followed by a heavy-fermion formation at higher concentrations. These observations follow the Doniach phase diagram as a function of $$x$$.

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：54.48(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

Single crystal growth and fermi surface properties of an antiferromagnet UPdGa$$_5$$

池田 修悟; 松田 達磨; 芳賀 芳範; 山本 悦嗣; 中島 美帆*; 桐田 伸悟*; 小林 達生*; 辺土 正人*; 上床 美也*; 山上 浩志*; et al.

Journal of the Physical Society of Japan, 74(8), p.2277 - 2281, 2005/08

https://doi.org/10.1143/JPSJ.74.2277
 被引用回数：10 パーセンタイル：53.00(Physics, Multidisciplinary)

ガリウムの自己フラックス法により、反強磁性体UPdGa$$_5$$の純良な単結晶を育成することに成功した。ドハース・ファンアルフェン効果測定を行うことにより、この系には、反強磁性体UPtGa$$_5$$とよく似た円柱状フェルミ面が含まれていることがわかった。また加圧下電気抵抗測定により、ネール点が3.1GPaで消失することを明らかにした。つまり加圧によって、3.1GPa以上では、反強磁性から常磁性状態へと変化することがわかった。

論文

Novel pressure phase diagram of heavy fermion superconductor CePt$$_{3}$$Si investigated by ac calorimetry

立岩 尚之; 芳賀 芳範; 松田 達磨; 池田 修悟; 安田 敬*; 竹内 徹也*; 摂待 力生*; 大貫 惇睦

Journal of the Physical Society of Japan, 74(7), p.1903 - 1906, 2005/07

https://doi.org/10.1143/JPSJ.74.1903
 被引用回数：73 パーセンタイル：89.00(Physics, Multidisciplinary)

結晶反転対称性のない重い電子系超伝導物質CePt$$_3$$Siの反強磁性・超伝導転移温度の圧力依存性を交流比熱測定によって調べた。常圧で2.2Kである反強磁性転移温度(ネール温度$$T_{rm N}$$)は加圧とともに減少し消滅する。反強磁性臨界圧力$$P_{rm AF}$$は0.6GPaと決定された。一方、超伝導相は常圧から1.5GPaの幅広い圧力領域で存在する。CePt$$_3$$Siの圧力相図は大変独創的で、これまでの重い電子系超伝導物質の圧力相図と大きな違いがある。

論文

Single-crystal growth and magnetic properties of a new ternary uranium compound U$$_3$$Ni$$_5$$Al$$_{19}$$

芳賀 芳範; 松田 達磨; 池田 修悟; Galatanu, A.; 松本 拓也*; 杉本 豊成*; 多田 俊治*; 野口 悟*; 大貫 惇睦

Physica B; Condensed Matter, 359-361, p.1006 - 1008, 2005/04

https://doi.org/10.1016/j.physb.2005.01.379
 被引用回数：3 パーセンタイル：16.39(Physics, Condensed Matter)

新しいウラン化合物U$$_3$$Ni$$_5$$Al$$_{19}$$を発見し、単結晶育成に成功した。斜方晶の結晶構造を有し、ウランは結晶学的に2つのサイトを占める。磁化の異方性から、そのうち一つのサイトのウランだけが反強磁性秩序を起こし、もう一つのウランは低温まで常磁性状態にあると考えられる。

論文

Large orbital magnetic moment and its quenching in the itinerant uranium intermetallic compounds U${it T}$Ga$$_5$$ (${it T}$=Ni, Pd, Pt)

金子 耕士; 目時 直人; Bernhoeft, N.*; Lander, G. H.; 石井 慶信; 池田 修悟; 常磐 欣文; 芳賀 芳範; 大貫 惇睦

Physical Review B, 68(21), p.214419_1 - 214419_9, 2003/12

https://doi.org/10.1103/PhysRevB.68.214419
 被引用回数：60 パーセンタイル：88.37(Materials Science, Multidisciplinary)

UTGa$$_5$$(T=Ni, Pd, Pt)は、強い遍歴性を示す反強磁性体である。この内Ni, Ptでは常磁性状態において、ほぼ同じ結晶構造を持ち、電子構造も酷似しているにもかかわらず、c底面内の最隣接間相互作用の符号が異なっている点は興味深い。粉末中性子回折実験による詳細な結晶構造解析の結果、構造の一部を成すUGa$$_3$$ブロックの局所的な歪みにT=Ni, Pd, Ptで系統性があることを明らかにした。またT$$_N$$で磁歪の存在を見出し、それが3者の磁気構造の違いに対応した系統性を示している事を明らかにした。T=Ni, Ptについては、単結晶中性子回折実験から磁気形状因子を明らかにし、軌道磁気モーメントの大きな寄与の存在を明らかにするとともに、その凍結の度合いが、帯磁率における遍歴性と対応して、両者で大きく異なっている事を明らかにした。以上の結果から、UTGa$$_5$$におけるUGa$$_3$$ブロックの局所的な歪みが、最隣接間相互作用の符号に加え、磁歪,軌道磁気モーメントの凍結,遍歴性に密接に関与しているとともに、5fの遍歴系において軌道が重要な役割を演じる事を示唆している。

31 件中 1件目～20件目を表示