NMR Study of Uranium Ternary Compounds with a Weak Magnetic Interaction

弱磁相互作用铀三元化合物的核磁共振研究

• 批准号: 04640342
• 负责人: KOJIMA Kenichi
• 金额: $ 1.28万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640342/
• 关键词: Actinide compound; Uranium compound; ternary compound; Heavy electron state; NMR; 三元系物質; ナイトシフト

In order to investigate interesting physical phenomena such as the Kondo effect and heavy fermion behavior for uranium ternary compounds, we have searched the uranium ternary compounds with a weak magnetic interaction and have studied them microscopically with NMR.Prof.Takabatake, and investigator, has synthesized new U-T-Ga compounds (T=Ni, Cu and Pd). In these compounds UCu_<3+x>Ga_<2-x> (0.1*x*0.8) shows a maximum T_N(x) near x=0.3 and a nonmagnetic heavy-fermion state with further increase in x.Prof.Kojima, the head investigator, has performed NMR measurement for UPt_2Sn and U_3Pt_3Sn_4. The ^<119>Sn NMR is observable down to 4.2 K in spite of disappearance of the ^<195>Pt NMR below T_N=60K.This suggests a spin structure which results in a cancellation of the transferred hyperfine fields at a Sn site. ^<195>Pt and ^<119>Sn Knight shifts in U_3Pt_3Sn_4 have been measured down to 4.2 K and temperature variations of the Knight shift saturate near 4.2 K.This results suggest that the 5f electron state is delocalized in this temperature range.

为了研究铀三元化合物的Kondo效应和重费米子行为等有趣的物理现象，我们寻找了具有弱磁相互作用的铀三元化合物，并用NMR对其进行了微观研究。在这些化合物中，UCu_&lt；3+x&gt；Ga_&lt；2-x&gt；(0.1*x*0.8)在x=0.3附近出现最大T_N(X)，随着x的进一步增加，呈现非磁性的重费米子态。T_N=60K以下的PT核磁共振。这表明了一种自旋结构，它导致了Sn位上转移的超精细场的抵消。测量了U_3PT_3SN_4中的^&lt；195&gt；Pt和^&lt；119&gt；Sn4的Knight位移在4.2K以下的温度变化。这表明5f电子态在这个温度范围内是离域的。

项目成果

K.Kojima: "NMR study of UPt_2Sn" Physica B. (1993)

K.Kojima：“UPt_2Sn 的核磁共振研究”Physica B. (1993)

T.Takabatake: "Structural and Physical Properties of New U-T-Ga Compounds(T=Ni,Cu and Pt)" Physica B. 186-188. 734-737 (1993)

T.Takabatake：“新型 U-T-Ga 化合物（T=Ni、Cu 和 Pt）的结构和物理性质”Physica B. 186-188。

T.Takabatake et al.: "Structural and Physical Properties of New U-T-Ga Compounds(T=Ni, Cu and Pt)" Physica. B, 186-188. 734-737 (1993)

T.Takabatake 等人：“新型 U-T-Ga 化合物（T=Ni、Cu 和 Pt）的结构和物理性质”物理学。

K.Kojima: "NMR Study of UPt_2Sn" Physica B. 186-188. 691-693 (1993)

K.Kojima：“UPt_2Sn 的核磁共振研究”Physica B.186-188。

K.Kojima et al.: "NMR Study on UPt_2Sn" Physica. B, 186-188. 691-693 (1993)

K.Kojima 等人：“UPt_2Sn 的 NMR 研究”物理学。