Localized or itinerant: nature of strongly correlated f electron system and the quantum critical point-investigation based on the measurements of Fermi surface properties

局域或流动:强相关 f 电子系统的性质和基于费米表面特性测量的量子临界点研究

基本信息

  • 批准号:
    12440093
  • 负责人:
  • 金额:
    $ 9.28万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2000
  • 资助国家:
    日本
  • 起止时间:
    2000 至 2002
  • 项目状态:
    已结题

项目摘要

1. We have successfully developed a piston-cylinder type pressure cell which can measure the dHvA effect under pressures up to 3GPa2. It has been demonstrated from the measurements under pressure that the metamagnetic transition in CeRu2Si2 is closely related with the quantum critical point of this compound3. We have grown high quality single crystals of magnetic Uge_2 where superconductivity has been recently discovered under pressure. We have performed the de Haas-van Alpben (dHvA) effect measurements from the ambient pressure to the pressures beyond the quantum critical point(QCP). When the filed is applied parallel to the a-axis, the Fermi surface changes drastically across the quantum critical point(QCP) and the effective masses are enhanced around the QCP. When the field is applied parallel to the b-axis, two anomalies Bx(P) and Bm(P) are observed. Bm(P) corresponds to a metamagnetic transition and Bx(P) to the anomaly Tx. The electronic structure changes smoothly up to Bx(P) and changes drastically across Bx(P)4. We have perfomed the dHvA measurements in ZrZn_2 and Celn_3 under pressures up to their QCP's. In ZrZn_2 we have revealed the pressure dependences of the effective mass and frequencies of the α and β oscillations which correspond to the majority and minority spin bands, respectively. The effective masses do not change significantly with pressure. The frequency difference is found to remain finite even near the QCP. The dHvA frequency and effective of CeIn3 are found to increase with pressure5. We have revealed the pressure dependence of Fermi surface properties of PrPb_3
1.我们已经成功地开发了一种活塞缸式压力传感器,可以测量的dHvA效应的压力下,高达3GPa ~ 2。压力下的测量结果表明,CeRu_2Si_2的变磁转变与该化合物的量子临界点密切相关。我们生长了高质量的磁性UGe_2单晶,其中最近发现了压力下的超导性。我们进行了德哈斯-范阿尔本(dHvA)效应的测量从环境压力到超过量子临界点(QCP)的压力。当磁场平行于a轴时,费米面在量子临界点(QCP)附近发生剧烈变化,有效质量在QCP附近增强。当磁场平行于b轴施加时,观察到两个异常Bx(P)和Bm(P)。Bm(P)对应于变磁跃迁,Bx(P)对应于异常Tx。电子结构在Bx(P)之前平滑变化,在Bx(P)4之间急剧变化。我们在ZrZn_2和CeIn_3中进行了dHvA测量,测量的压力达到它们的QCP。在ZrZn_2中,我们揭示了α和β振荡的有效质量和频率的压力依赖性,它们分别对应于多数和少数自旋带。有效质量不随压力显著变化。发现频率差即使在QCP附近也是有限的。发现CeIn 3的dHvA频率和有效性随压力增加5。我们揭示了PrPb_3费米面性质的压力依赖性

项目成果

期刊论文数量(201)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
K.Tateiwa, et al.: "Transport, Thermal and Magnetic Properties of the New Ternary Compound U_3Pd_<20>Si_6:Possibility of a New Localized 5f Electrons System"J.Phys.Soc.Jpn. 69. 1517-1520 (2000)
K.Tateiwa等人:“新三元化合物U_3Pd_ 20 Si_6的传输、热和磁特性:新局域5f电子系统的可能性”J.Phys.Soc.Jpn。
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    0
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T.Terashima, et al.: "De Haas-van Alphen Effect Studies on the Ferromagnetic Superconductor UGe_2 Under High Pressure"J.Phys.Soc.Jpn. 71. 29-32 (2002)
T.Terashima等人:“高压下铁磁超导体UGe_2的德哈斯-范阿尔芬效应研究”J.Phys.Soc.Jpn。
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    0
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N.Tateiwa, et al.: "Neutron Scattering Experiment on U_3Pd_<20>Si_6 I : Crystal and Magnetic Structures"Physica B. 312. 891-893 (2002)
N.Tateiwa等人:“U_3Pd_20Si_6I上的中子散射实验:晶体和磁性结构”Physica B.312.891-893(2002)
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    0
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V.Sechovsky: "Non-symmetric metamagnetic transition in UNiAl"Physica B. 281&282. 210-212 (2000)
V.Sechovsky:“UNiAl 中的非对称变磁转变”Physica B.281
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    0
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J.Tang: "Pressure Effect on the quadrupolar order in TmTe"Physica B. 281&282. 571-573 (2000)
J.Tang:“压力对 TmTe 中四极有序的影响”Physica B.281
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AOKI Haruyoshi其他文献

AOKI Haruyoshi的其他文献

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{{ truncateString('AOKI Haruyoshi', 18)}}的其他基金

Nearly Localized f Electron and Quantum Phenomena
电子和量子现象的近局域化
  • 批准号:
    19204034
  • 财政年份:
    2007
  • 资助金额:
    $ 9.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
EVOLUTION OF F ELECTRON STATE DUE TO THE MANY BODY EFFECT ARISING FROM SPIN AND ORBITAL DEGRESS OF FREEDOM-EXPERIMENTAL STUDIES ON ALLOYS OF THE F ELECTRON COMPOUNDS
自旋和轨道自由度引起的多体效应引起的F电子态的演化-F电子化合物合金的实验研究
  • 批准号:
    16340095
  • 财政年份:
    2004
  • 资助金额:
    $ 9.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Electronic structures of the systems with orbital degeneracy
轨道简并系统的电子结构
  • 批准号:
    11220203
  • 财政年份:
    1999
  • 资助金额:
    $ 9.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas (B)
DEUALITY NATURE OF 5f ELECTRON SYSTEMS IN URANIUM COMPOUNDS
铀化合物中5f电子系统的对偶性
  • 批准号:
    10640322
  • 财政年份:
    1998
  • 资助金额:
    $ 9.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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变磁转变引起的巨磁热效应用于氢磁制冷
  • 批准号:
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    2001
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Materials research for new magnetic refrigeration using metamagnetic transition
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