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Study on the Kondo effect of ions with multi-electron occupancy

Research Project

Project/Area Number 09640451
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物性一般(含基礎論)
Research InstitutionTohoku University

Principal Investigator

SAKAI Osamu  Tohoku University, Graduate School of Science, associate professor, 理学研究科, 助教授 (60005957)

Co-Investigator(Kenkyū-buntansha) SHIMIZU Yukihiro  Tohoku University, Graduate School of Technology, research associate, 工学研究科, 助手 (70250727)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥3,000,000 (Direct Cost: ¥3,000,000)
Keywordstwo channel Kondo model / non-Fermi liquid / Uranium compound / magnetic impurity / Anderson model / numerical renormalization group / ラウン化合物
Research Abstract

We have studied following subjects.
(1) It is known that the impurity Anderson model (TAM), which is a fundamental model for the magnetic ion in metal, has certainly the local Fermi liquid (LFL) properties in large hybridization limit. Does the non-Fermi liquid (NFL) state appear in the LAM? If it does, what kind of transition occurs between the LFL and the NFL states.
(2) The system1 U_xTh_<1-x>Ru2Si_2 shows anomalous low temperature behaviors similar to those of the NFL state of the two channel Kondo model (TCKM) type. But its resistivity decreases with decreasing temperature. Usually it is expected to increase in the TCKM.Can this resistivity be explained based on the IAM?
(3) It is known that the TCKM has a residual entropy 1/ In at T=0. This will be released under the lowering of the crystal symmetry, and the specific heat will show a peak at a characteristic temperature. How the increase of the magnetic susceptibility with - In T behave near the characteristic temperature?
Following conclusions are derived. (1) The IAM has various types of ground states including both LFL and NFL natures depending on the crystalline field when the hybridization is changed. (2) We can expect the decreasing resistivity when the valence fluctuation between f^2 and f^3ates dominates. (3) The characteristic temperature is about 1/10 of the crystalline field splitting. At that temperature the increase of the susceptibility saturates. The residual entropy in the NFL state is still 1/ in 2 even when the parameters are situated very near the transition point to the LFL state.
Recently, the specific heat under strong magnetic field is measured for U_xTh_<1-x>Ru_2Si_2, and the residual entropy is not observed. Based on the results of the present study, we may conclude that the scenario of the TCKM type seems not applicable simply to this system. Roles of the dynamical Jahn-Teller effect are now under consideration.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Yukihiro Shimizu: "Analysis of Non-Fermi-liquid Behavior in Dilute Uranium Alloy Based on Numerical Renormalization Group Method" Journal of Magnetism and Magnetic Materials. 177-181. 316-318 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Osamu Sakai: "T^<1/2> Decreasing Resistivity with Decreasing Temperature : A Two Chan-nel Impurity Anderson Model with an Extra Local Spin" Journal of Magnetism and Magnetic Materials. 177-181. 327-328 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ryu Takayama: "Single Impurity Anderson Model with Coulomb Repulsion between Conduction Electrons on the Nearest Neighbour Ligand Orbital" Journal of Physical Society of Japan. 67・6. 1844-18〓〓 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yukihiro Shimizu: "Numerical Renormalization Group Study of non-Fermi-liquid State on Dilute Uranium Systems" Journal of Physical Society of Japan. 67・7. 2395-2407 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wataru Izumida: "Kondo Effect in Single Quantum Dot Systems-Study with Numerical Renormalization Group Method-" Journal of Physical Society of Japan. 67・7. 2444-2454 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ryosuke Shiina: "Interplay of Fileld-Induced Multipoles in CeB_6" Journal of Physical Society of Japan. 67・3. 941-949 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yukihiro shimizu: "Analysis of Non-Fermi-liquid Behavior in Dilute Uranium Alloy Based on Numerical Renormalization Group Method" J.M.M.Mat.Vol.177-181. 316-318 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Osamu Sakai: "T^<1/2> Decreasing Resistivity with Decreasing Temperature : A Two Channel Impurity Anderson Model with an Extra Local Spin" J.M.M.Mat.Vol.177-181. 327-328 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ryu Takayama: "Single Impurity Anderson Model with Coulomb Repulsion between Con-duction Electrons on the Nearest Neighbor Ligand Orbital" J.Phys.Soc.Jpn.Vol.67 No.6. 1844-1847 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yukihiro Shimizu: "Numerical Renormalization Group Study of non-Fermi-liquid State on Di-lute Uranium Systems" J.Phys.Soc.Jpn.Vol.67 No.7. 2394-2407 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wataru Izumida: "Kondo Effect in Single Quantum Dot Systems -Study with Numerical Renormalization Group Method-" J.Phys.Soc.Jpn.Vol.67 No.7. 2444-2454 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ryousuke Shiina: "Interplay of Field-Induced Multipoles in CeB_6" J.Phys.Soc.Jpn.Vol.67 No.3. 941-949 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yukihiro Shimizu: "Analysis of Non-Fermi-liquid Behavior in Dilute Uranium Alloy Based on Numerical Renormalization Group Method" Journal of Magnetism and Magnetic Materials. 177-181. 316-318 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Osamu Sakai: "T^<1/2> Decreasing Resistivity with Decreasing Temperature : A Two Channel Impurity Anderson Model with an Extra Local Spin" Journal of Magnetism and Magnetic Materials. 177-181. 327-328 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Ryu Takayama: "Singlc Impurity Anderson Model with Coulomb Repulsion between Conduction Electrons on the Nearest Neighbour Ligand Orbital" Journal of Physical Society of Japan. 67・6. 1844-1847 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yukihiro Shimizu: "Numerical Renormalization Group Study of non-Fermi-liquid State on Dilute Uranium Systems" Journal of Physical Society of Japan. 67・7. 2395-2407 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Wataru Izumida: "Koudo Effect in Single Quantum Dot Systems-Study with Numerical Renormalization Group Method" Journal of Physical Society of Japan. 67・7. 2444-2454 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Ryousuke Shiina: "Interplay of Fileld-Induced Multipoles in CeB_6" Journal of Physical Society of Japan. 67・3. 941-949 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Osamu Sakai, Shunya Suzuki, and Yukihiro Shimizu.: "Competition and Transitions of the Ground State Properties of the Impurity Anderson Model with Multi-Electron Occupancy" Solid State Communications. 101・11. 791-796 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Wataru Izumida, Osamu Sakai, and Yukihiro Shimizu.: "Many Body Effects on Electron Tunneling through Quantum Dots in Aharonov-Bohm Circuit" Journal of the Physical Society of Japan. 66・3. 717-726 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ryu Takayama and Osamu Sakai.: "Excitation Spectra of the Anderson Model with Charge Screening through d-f Coulomb Interaction" Journal of the Physical Society of Japan. 66・5. 1512-1525 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Morita, Y.Kaneta, Osamu Sakai, 他: "Fermi Surface of Low Carrier Compound CeBi" Physica. B230-232. 192-194 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Shunya Suzuki, Osamu Sakai, and Yukihiro Shimizu.: "An Extended Anderson Model that shows Decreasing Resistivity with Decreasing Temperature" Solid State Communucations. 104・7. 429-433 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Osamu Sakai, Ryousuke Shiina, Hiroyuki Shiba, and Peter Thalmeier.: "A New Interpretation of NMR in Quadrupolar Ordering Phase of CeB_6-Consistency with Neutron Scattering" Journal of Physical Society of Japan. 66・10. 3005-3007 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.-D.Kim, O.Sakai,: "Surface and Bulk 4f-Photoemission Spectra of CeIn_3 and CeSn_3" Phyisical Review. B56・3. 1620-1624 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Tsunekawa, O.Sakai,: "High Resolution Photoemision Study of CeRu_2Si_2" Solid State Communications. 103・12. 659-662 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ryousuke Shiina, Osamu Sakai, Hiroyuki Shiba, and Peter Thalmeier.: "Interplay of Fileld-Induced Multipoles in CeB_6" Journal of Physical Society of Japan. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Osamu Sakai, Shunya Suzuki, and Yukihiro Shimizu.: "T^<1/2> Decreasing Resistivity with Decreasing Temperature : A Two Channel Impurity Anderson Model with an Extra Local Spin" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yukihiro Shimizu, Osamu Sakai, and Shynya Suzuki.: "Analysis of Non-Fermi-liquid Behavior in Dilute Uranium Alloy Based on Numerical Renormalization Group Method" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hiroshi Kumigashira, Osamu Sakai,: "Surface and Bulk 4f Electron Structure of CeIn_3 and CeSn_3" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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