1996 Fiscal Year Final Research Report Summary
NMR Study on Metal-Insulator Transition and High T_C Superconductivity
| Project/Area Number |
08044045
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Hokkaido University |
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Principal Investigator |
KUMAGAI Kenichi Graduate School of Science, Hokkaido University, Professor, 大学院・理学研究科, 教授 (70029560)
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| Co-Investigator(Kenkyū-buntansha) |
ピスクノフ Y. ロシア, ロシア科学アカデミーウラル研究所, 研究員
ヤクボフスキー A. ロシア, クルチャトフ研究所, 主任研究員
マリ ミハエル スイス, チューリッヒ大学, 講師
ロス ジョゼフ スイス, チューリッヒ大学, 講師
ブリンクマン D. スイス, チューリッヒ大学, 教授
FURUKAWA Yuji Graduate School of Science, Hokkaido University, 大学院・理学研究科, 助手 (50280863)
MATSUDA Yuji Graduate School of Science, Hokkaido University, 大学院・理学研究科, 助教授 (50199816)
PISKUNOV Yuri Russian Academy of Sciences, Russia
YAKUBOVSKII Andrey Kurchatov Institute, Russia
MALI Mija Zurich University, Switzerland
BRINKMANN Detlef Zurich University, Switzerland
ROOS Joseph Zurich University, Switzerland
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| Project Period (FY) |
1996
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| Keywords | NMR / Oxide / High-T_c superconductivity / strongly correlated electron system / metal-insulator transition / YNi_2B_2C / spinel compound |
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| Research Abstract |
In this project, unusual electronic properties of the strongly correlated systems such as quaternary compound YNi_2B_2C and RPt_2B_2C have been investigated by NMR measurement at both Zurich university and Hokkaido university. The enhancements of T_1T and Knight shift of ^<11>B at low temperature are not attributed to the effect of 3d spin fluctuations in the superconducting YNi_2B_2C families, but are attributed to peculiarities of their band structure.
We have also prepared some Cu spinel compound of CuIr_2S_4 which shows metal-insulator (MI) transition. Sample of CuIr_2S_4 with enriched isotope of ^<33>S are prepared with collaboration of Russian group. From the results of line width and Knight shift of Cu-NMR,we confirmed no magnetic moment in the insulating state of CuIr_2S_4. We obtained also phase diagram of the MI transition of CuIr_2 (S_<1-x>Se_x)_4. Magnetic and local electronic states at the Metal-Insulator transition have been discussed and presented at the International Conference of Materials and Mechanism of High Tc-Superconductivity at Beijing.
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Research Products
(12 results)
