Pressure-Induced Electron Transitions and Physical Anomalies in Pd-Ce Alloys of the f-Electron Systems

f 电子系统 Pd-Ce 合金中的压力诱导电子跃迁和物理异常

基本信息

  • 批准号:
    06650731
  • 负责人:
  • 金额:
    $ 1.28万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1994
  • 资助国家:
    日本
  • 起止时间:
    1994 至 1995
  • 项目状态:
    已结题

项目摘要

In this study, we have developed the fluorescence XANES measurement method using a conventional diamond anvil pressure cell (DAC) and a focused synchrotron beam at BL-7C of the Photon Factory in KEK.By this method, Ce-L_<III> XANES spectra were measured for PdCe and GaCe alloys under various high pressures up to-10 GPa. We confirmed the pressure-induced-transition of 4f electrons (the pressurechanges of Ce valence) in these alloy phases. We also carrid out high pressure electrical resistivity measurements and high pressure X-ray diffraction experiments in order to examine the relationship between the Ce valence and the anomalous resistivity (the dense Kondo effect) , and the following results were obtained.1.The Ce valence estimated from the fluorescence L_<III> XANES spectra varies from 3.02 (at ambient pressure) to 3.14 (at 9 GPa) in GaCe alloy phases. Since the Ce valence in PdCe has the similar pressure dependence, the electron transition of 4f^1*4f^0 in alloy-phases is promoted by the external pressure.2.In the GaCe alloy phase, the dense Kondo effect is strongly enhanced by external pressure up to about 6 GPa as in the PdCe phase. The effect becomes weaker gradually with pressure above 6 GPa.3.The rate of decrease in volume with pressure, or the compressibility, of GaCe is remarkably larger than that of PdCe.4.There is a most suitable Ce-Ce atomic distance, or Ce valence, for the distinct appearance of dense Kondo effect.
在本研究中,我们在KEK光子工厂的BL-7 C实验室中,利用传统的金刚石压砧(DAC)和聚焦同步辐射束,发展了荧光XANES测量方法,<III>测量了PdCe和GaCe合金在不同压力下的Ce-L_ XANES光谱,最高压力可达-10GPa。我们证实了4f电子的压力诱导跃迁(Ce价态的压力变化)。我们还进行了高压电阻率测量和高压X射线衍射实验,以研究Ce的价态与异常电阻率(致密近藤效应)之间的关系,并得到以下结果:1.由荧光L_ XANES谱估算的<III>Ce在GaCe合金相中的价态变化范围为3.02(常压)~ 3.14(9 GPa)。由于PdCe中Ce的价态具有与PdCe相似的压力依赖性,外压促进了合金相的4f^1*4f^0电子跃迁。2.在GaCe合金相中,与PdCe相一样,当外压达到约6 GPa时,致密的近藤效应也被强烈增强。当压力大于6 GPa时,近藤效应逐渐减弱; 3. GaCe的体积随压力的减小率(压缩率)明显大于PdCe; 4.存在一个最佳的Ce-Ce原子间距(Ce价),使近藤效应明显出现.

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Masaru Itakura: "Pattern Evolution of Periodic Antiphase Boundaries with the Changes in Domain Size of L-Pd_5Ce" Proc.13th Int.Cong.Electron Microscopy. Vol.2. 669-670 (1994)
Masaru Itakura:“周期性反相边界的模式演化随 L-Pd_5Ce 域尺寸的变化”Proc.13th Int.Cong.Electron Microscopy。
  • DOI:
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    0
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M. Itakura et al.: "Pattern Evolution of Periodic Antiphase Boundaries with the Change inDomain Size of L-Pd_5Ce" Proc. 13th Int .Cong. Electron Microscopy. 2. 669-670 (1994)
M. Itakura 等人:“周期性反相边界的模式演化随 L-Pd_5Ce 域大小的变化”Proc。
  • DOI:
  • 发表时间:
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  • 影响因子:
    0
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  • 通讯作者:
M.Itakura et al.: "Pattern Evolution of Periodic Antiphase Antiphase Boundaries with the Change in Domain Size of L-Pd_5Ce" Proc.13th Int. Cong. Electron Microscopy. 2. 699-670 (1994)
M.Itakura 等人:“周期性反相反相边界的模式演化随 L-Pd_5Ce 域大小的变化”Proc.13th Int。
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OKI Kensuke其他文献

OKI Kensuke的其他文献

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{{ truncateString('OKI Kensuke', 18)}}的其他基金

Establishment of new analytical technique applicable for local atomic arrangements in various multi-component materials
建立适用于各种多组分材料中局部原子排列的新分析技术
  • 批准号:
    10450234
  • 财政年份:
    1998
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Order-Disorder Transformation Processes with Composition Variations Studied by IKL-ALCHEMI-EDX Method
IKL-ALCHEMI-EDX 方法研究成分变化的有序-无序转化过程
  • 批准号:
    08455293
  • 财政年份:
    1996
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of a Control Techique for Microstructures in Nd-Fe-B Magnetic Materials produced by HDDR Process
HDDR工艺生产的Nd-Fe-B磁性材料微观结构控制技术的开发
  • 批准号:
    07555479
  • 财政年份:
    1995
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
The behavior and roles of antiphase boundaries in order-disorder transformation processes
有序-无序转换过程中反相边界的行为和作用
  • 批准号:
    03452247
  • 财政年份:
    1991
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Dependence of Valence Fluctuation and Physical Anomalies on the Degree of Order in Pd-Ce Ordering Alloys
Pd-Ce有序合金中价态波动和物理异常对有序度的依赖性
  • 批准号:
    01550511
  • 财政年份:
    1989
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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