| Project/Area Number |
17K14332
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Saitama University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 四極子秩序 / 共鳴X線回折 / 元素置換 / 希土類金属磁性体 / 結晶対称性 / 長周期 / 多重極子 / 強相関電子系 / 多重極子秩序 / 共鳴X線散乱 |
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| Outline of Final Research Achievements |
Resonant X-ray diffraction (RXD) experiments on the Rare-earth palladium bronzes RPd3S4 were performed at the L3 absorption edge to study the order parameter of the multipolar ordering and the interactions between the multipolar moments in RPd3S4(R=Ce,Pr,Sm,Tb). RPd3S4 crystallize in a cubic structure. A resonant and a diffuse scattering of quadrupole ordering were observed in TbPd3S4. The diffuse scattering indicate a competition between quadrupole interactions. Magnetization, magnetic susceptibility, specific heat, and electric resistivity were measured in T substitute R(Pd1-xTx)3S4 (R=Ce,Pr, T=Pt,Ag,Ni). The transition temperature TC of CePd3S4 is down to around 2 K, a new AFM transition was observed at TN~7 K. We determined the T - x phase diagram, and discuss the phase transitions at TC and TN. The results suggest the possibility of the presence of the correlation between the magnetic interaction and the quadrupole interaction.
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| Academic Significance and Societal Importance of the Research Achievements |
エントロピーを解放するために低温で生じる磁気秩序などの相転移の秩序変数として，従来の 磁気双極子モーメントよりも高次の多極子モーメントの役割を明らかにすることが重要となっている。特に，近年の多極子の揺らぎによる非従来型超伝導などの新規物性の発見からも，その基礎となる多極子秩序の研究は急務である。
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