Research on Degree of Localization off-electrons in Uranium Monopnictides and Moncharcogenides

铀一元化合物和二元化合物离电子局域化程度的研究

• 批准号: 06640464
• 负责人: OCHIAI Akira
• 金额: $ 1.34万
• 依托单位: Tohoku University, Institute for Materials Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640464/
• 关键词: Uranium monopnictides; Uranium monocharcogenides; 5f-electrons; de Haas-van Alphen effect; ウランモノカルコゲナイド; ド・ハ-ス-ファン・アルフェン効果; f電子; ド・ハ-ス・アルフェン効果; 局在性

Following single crystals were grown ;1.High quality single crystals of USb were obtained by using highly purified uranium metal, precise control of stoichiometry and annealing etc.2.Single crystal of UAs was grown by Bridgman technique.3.High quality single crystal of ThSb which is reference material of USb was grown using highly purified Th metal.4.Single crystals of uranium monocharcogenides from US to UTe were grown by Bridgman technique.Using these single crystalsfollowing new results were obtained ;1.Characteristic physical properties of USb compared to UAs and UP are considered to be due to its semimetallic character. Now by magnetic and acoustic de Haas effect two kind of ellipsoidal Femisurface and spherical Fermi surface are observed.2.USb shows magnetic phase transition by magnetic field of about 40T.3.Magnetic phase transition of USb under high pressure was observed by electric resistivity and neutron scattering measurement.4.UAs shows sample dependent transport property.5.The r.r.r.of ThSb is rather improved and its de Haas effect experiment is now in progress.X-ray magnetic scattering and magnetic Compton scattering experiments were performed for UTe, and contrary our expectation its 5f orbital is rather broad. Same experiments for US and USe are now in progress.

单晶生长; 1.采用高纯金属铀获得了高质量的USb单晶，采用坩埚下降法生长了UAs单晶; 3.采用高纯Th金属生长了高质量的超快中子标准物质ThSb单晶; 4.采用坩埚下降法生长了从超快中子到超快中子的单碳族铀单晶利用这些单晶，得到了以下新的结果：1.与UAs和UP相比，USb的特征物理性质被认为是由于它的半金属性质。利用磁和声学的de哈斯效应，我们得到了两种不同的椭球费米面和球形费米面。2.在40 T左右的磁场作用下，USb发生了磁相变。3.通过电阻率和中子散射测量，观察到了高压下USb的磁相变。4. UAs表现出与样品有关的输运性质。5. ThSb的相对电阻率得到了较大的提高，其de哈斯效应实验表明，在40 T左右的磁场作用下，USb发生了磁相变。对UTe进行了X射线磁散射和磁康普顿散射实验，发现它的5 f轨道与我们的预期相反，相当宽。美国和美国的同样实验正在进行中。

项目成果

E.Hotta, A.Ochiai, Y.Suzuki, T.Shikama, K.Suzuki, Y.Haga and T.Suzuki: "Purification of USb and its de Haas-van Alphen effect" J.Alloys Comp.219. 252-255 (1995)

E.Hotta、A.Ochiai、Y.Suzuki、T.Shikama、K.Suzuki、Y.Haga 和 T.Suzuki：“USb 的纯化及其 de Haas-van Alphen 效应”J.Alloys Comp.219。

Akira Ochiai: "Transport Properties of USb and UTe" Sci.Rep.RITU. A40. 5-7 (1994)

Akira Ochiai：“USB 和 UTe 的传输特性”Sci.Rep.RITU。

K.Suzuki, F.Wastin, A.Ochiai, T.Shikama, Y.Suzuki, Y.Shiokawa, T.Mitaugashira, T.Suzuki and T.Komatsubara: "Preparation of actinide compounds in the Oharaifacility" J.Alloys Comp. 213/214. 178-184 (1994)

K.Suzuki、F.Wastin、A.Ochiai、T.Shikama、Y.Suzuki、Y.Shiokawa、T.Mitaugashira、T.Suzuki 和 T.Komatsubara：“在 Oharai 设施中制备锕系化合物” J.Alloys Comp。

Kenji Suzuki: "Preparation of actinide compounds in the Oharai facility" Journal of Alloys and Compounds. 213/214. 178-184 (1994)

Kenji Suzuki：“Oharai 设施中锕系化合物的制备”《合金与化合物杂志》。

落合明: "希土類やウランのプニクタイト、カルコゲナイドの高品質単結晶育成" 固体物理. 29. 811-814 (1994)

Akira Ochiai：“稀土和铀磷铁矿和硫属化物的高质量单晶生长”固体物理 29. 811-814 (1994)。