Heavy Fermion State in the Pr-based Skutterudites
镨基方钴矿中的重费米子态
基本信息
- 批准号:13640369
- 负责人:
- 金额:$ 2.62万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
1. Pr-based heavy fermion compound PrFe_4P_<12>(1) By neutron scattering, muSR, nuclear specific heat measurements, the anomalous ordered state appearing below 6.5 K is found to be nonmagnetic. Considering the crystalline electric field (CEF) effect, it is highly probable to be an antiferro quadrupole ordered state. Using high quality single crystalline samples, field-temperature phase diagram has been determined. By applying the resonance level model, the energy scale of the heavy fermion state (or Kondo temperature) has been determined.(2) It is found that the substitution of La ions to Pr sites suppress the ordered state and makes the heavy fermion state restored even in zero field, suggesting that the quadruple ordering and the heavy fermion state are competing each other.2. Pr based heavy fermion superconductor PrOs_4Sb_<12>(1) Double jump structure at the superconducting phase transition has been confirmed and the field-vs-temperature phase diagram has been constructed by specific heat measurements. Using muSR technique, we found an internal magnetic field appearing in the superconducting state, which is the undoubted evidence for the broken time-reversal symmetry in the superconductivity; the first known instance of its kind in metallic materials.(2) By specific heat measurements, we discovered a field-induced ordered phase and confirmed that it is an antiferro quadrupole ordered state by neutron scattering. Based on this result, we proposed the most appropriate CEF level scheme.
1. (1)通过中子散射、muSR、核比热测量,发现在6.5 K以下出现的异常有序态是非磁性的。考虑到晶体电场效应,极有可能为反铁四极有序态。利用高质量的单晶样品,确定了场温相图。应用共振能级模型,确定了重费米子态(近藤温度)的能量尺度。(2)发现La离子取代Pr位点抑制了有序态,即使在零场下也能恢复重费米子态,表明四重有序态和重费米子态是相互竞争的。证实了Pr基重费米子超导体PrOs_4Sb_<12>(1)超导相变的双跳变结构,并通过比热测量建立了场温相图。利用muSR技术,我们发现了超导状态下出现的内部磁场,这是超导中时间反转对称性被打破的确凿证据;这是金属材料中已知的第一个实例。(2)通过比热测量,发现了场致有序相,并通过中子散射证实其为反铁四极有序态。在此基础上,我们提出了最合适的基金水平方案。
项目成果
期刊论文数量(109)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H.Sugawara: "Fermi surface of the heavy-fermion superconductor PrOs_4Sb_<12>"Phys. Rev. B. 66. 220504(R) (2002)
H.Sukawara:“重费米子超导体 PrOs_4Sb_<12> 的费米面”Phys。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
H.Kotegawa: "Unusual Superconductivity in Skutterudite Compound PrOs_4Sb_<12>"Acta Phys. Polonica B. 34・2. 1003-1006 (2003)
H.小手川:“方钴矿化合物PrOs_4Sb_<12>中的异常超导性”《Polonica B. 34·2》(2003)
- DOI:
- 发表时间:
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- 影响因子:0
- 作者:
- 通讯作者:
M.Kobayashi: "Pressure effect on the transport properties in heavy-fermion semimetal CeRu_4Sb_<12>"Physica B. 329-333. 605-606 (2003)
M.Kobayashi:“压力对重费米子半金属 CeRu_4Sb_<12> 输运特性的影响”Physica B. 329-333。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
H. Sugawara: "de Haas-van Alphen effect in heavy fermion superconductor PrOs_4Sb_<12>"Acta Phys. Polonica B. 34・2. 1125-1128 (2003)
H.菅原:“重费米子超导体PrOs_4Sb_<12>中的德哈斯-范阿尔芬效应”Acta Phys. B. 1125-1128 (2003)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
H. Sugawara: "High field magnetoresistance in heavy fermion superconductor PrOs_4Sb_<12>"Physica B. 329-333. 551-552 (2003)
H. Sukawara:“重费米子超导体 PrOs_4Sb_<12> 中的高场磁阻”Physica B. 329-333。
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- 影响因子:0
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Novel transport phenomena of strongly spin-orbit coupled electrons controlled through magnetic ions
通过磁离子控制的强自旋轨道耦合电子的新颖输运现象
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19H01839 - 财政年份:2019
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$ 2.62万 - 项目类别:
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Unconventional physical properties of 4f-electron-nuclear hyperfine-coupled multiplets
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23540421 - 财政年份:2011
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Preparation of Polyurethane Nanofibers by Emulsion Electrospinning
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23655209 - 财政年份:2011
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Grant-in-Aid for Challenging Exploratory Research
Hidden multipolar orderings explored by nuclear specific heat measurements
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20540359 - 财政年份:2008
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An attempt to develop non-viral gene therapy for advanced pancreatic cancer.
尝试开发针对晚期胰腺癌的非病毒基因疗法。
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13670503 - 财政年份:2001
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$ 2.62万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of antisense therapy for pancreatic cancer or hepatoma : potential of the tumor targeting.
胰腺癌或肝癌反义疗法的发展:肿瘤靶向的潜力。
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11670489 - 财政年份:1999
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Development of antisense oligonucleotide therapy for cancer.
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- 批准号:
09670531 - 财政年份:1997
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$ 2.62万 - 项目类别:
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Variational theory for the competition between the heavy fermion state and magnetically ordered states
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