1993 Fiscal Year Final Research Report Summary
NMR Study of Uranium Ternary Compounds with a Weak Magnetic Interaction
| Project/Area Number |
04640342
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
KOJIMA Kenichi Hiroshima Univ.Fac.Integrated Arts & Sciences, Associate Prof., 総合科学部, 助教授 (00100975)
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| Co-Investigator(Kenkyū-buntansha) |
TAKABATAKE Toshiro Hiroshima Univ.Fac.Integrated Arts & Sciences, Associate Prof., 総合科学部, 助教授 (40171540)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Actinide compound / Uranium compound / ternary compound / Heavy electron state / NMR |
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| Research Abstract |
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.
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