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CREATION OF NOVEL F-ELECTRON STATE BY HIGH PRESSURE AND ITS DIRECT OBSERVATION BY INFRARED SPECTROSCOPY

Research Project

Project/Area Number 17340096
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionKobe University

Principal Investigator

OKAMURA Hidekazu  Kobe University, 理学研究科, ASSOCIATE PROFESSOR (00273756)

Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥14,870,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥870,000)
Fiscal Year 2007: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2006: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥7,600,000 (Direct Cost: ¥7,600,000)
KeywordsHEAVY FERMION / F-ELECTRON / INFRARED SPECTROSCOPY / HIGH PRESSURE / SYNCHROTRON RADIATION / f電子
Research Abstract

THE AIM OF THIS RESEARCH PROJECT HAS BEEN THE STUDY OF THE CONDUCTION-F ELECTRON HYBRIDIZED ELECTRONIC STATE, REALIZED IN THE SO-CALLED HEAVY FERMION COMPOUNDS, UNDER HIGH PRESSURE USING INFRARED SPECTROSCOPY TECHNIQUE. TO CARRY OUT THE DIFFICULT INFRARED SPECTROSCOPY OF SMALL SAMPLES MOUNTED IN A PRESSURE GENERTING CELL (DIAMOND ANVIL CELL), A HIGH BRILLIANCE SYNCHROTRON RADIATION WAS USED AS AN INFRARED SOURCE AT THE BEAM LINE BL43IR OF SPRING-8. WE HAVE STUDIED THE EVOLUTION OF INFRARED SPECTRA UNDER HIGH PRESSURE FOR SUCH F ELECIRON COMPOUNDS AS YbA_<12>, YbS, ELEMENTAL Yb, AND CeRu_4Sb_<12> SO FAR. WE HAVE OBSERVED LARGE CHANGES IN THEIR INFRARED SPECTRA AS A FUNCTION OF EXTERNAL PRESSURE. WE HAVE INTERPRETED THE PRESSURE-INDUCED SPECTRAL CHANGES USING THE SO-CALLED C-F HYBRIDIZED BAND MODEL. WE PLAN TO FURTHER EXTEND OUR STUDIES OF F ELECTRON SYSTEMS UNDER HIGH PRESSURE IN THE FUTURE. IN ADDITION TO THE PRESSURE STUDIES, WE HAVE ALSO CONTINUED OUR WORK OF F ELECTRON SYSTEMS AT AMBIENT PRESSURE. WE HAVE OBSERVED A UNIVERSAL RELATION REGARDING THE OPTICAL CONDUCTIVITY OF MANY Ce AND Yb COMPOUNDS. THIS IS REMARKABLE SINCE SUCH A UNIVERSAL RELATION HAD BEEN KNOWN ONLY FOR THEIR GROUND STATE PROPETIES, KNOWN AS KADOWAKI-WOODS RELATION

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (20 results)

All 2008 2007 2006 2005 Other

All Journal Article (17 results) (of which Peer Reviewed: 6 results) Presentation (3 results)

  • [Journal Article] Universal scaling in the optical conductivity of heavy fermion compounds2008

    • Author(s)
      H. Okamura
    • Journal Title

      Physica B 403

      Pages: 761-763

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Optical Conductivity and Electronic Structures in Ce-Filled Skutterudites2008

    • Author(s)
      H. Okamura
    • Journal Title

      J. Phys. Soc. Jpn. 77(Suppl. A)

      Pages: 315-317

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pressure-tuning of the c-f hybridization in Yb metal detected by infrared spectros copy up to 18 GPa2007

    • Author(s)
      H. Okamura
    • Journal Title

      J. Phys. Soc. Jpn. 76 Suppl. A

      Pages: 9-11

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Universal scaling in the dynamical conductivity of heavy-fermion Ce and Yb compounds2007

    • Author(s)
      H. Okamura
    • Journal Title

      J. Phys. Soc. Jpn. 76

    • NAID

      210000106523

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Infrared study of valence transition compound YbInCu-4 using cleaved surfaces.2007

    • Author(s)
      H. Okamura
    • Journal Title

      Phys. Rev. B 75

    • NAID

      120000944202

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Pressure-tuning of the c-f hybridization in Yb metal detected by infrared spectroscopy up to 18 GPa2007

    • Author(s)
      H. OKAMURA
    • Journal Title

      J. PHYS. SOC. JPN 76

      Pages: 9-11

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Universal scaling in the dynamical conductivity of heavy-fermion Ce and Yb compounds2007

    • Author(s)
      H. OKAMURA
    • Journal Title

      J. PHYS. SOC. JPN 76, 023703

      Pages: 1-4

    • NAID

      210000106523

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Infrared study of valence transition compound YbInCu4 using cleaved surfaces2007

    • Author(s)
      H. OKAMURA
    • Journal Title

      PHYS. REV. B 75, 041101(R)

      Pages: 1-4

    • NAID

      120000944202

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Pressure-tuning of the c-f hybridization in Yb metal detected by infrared spectroscopy up to 18 GPa2007

    • Author(s)
      H. Okamura
    • Journal Title

      J. Phys. Soc. Jpn. 76(Suppl. A)

      Pages: 9-11

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Universal Scaling in the Dynamical Conductivity of Heavy Fermion Ce and Yb Compounds2007

    • Author(s)
      H.Okamura
    • Journal Title

      Journal of Physical Society of Japan 第76巻・第2号

      Pages: 23703-23703

    • NAID

      210000106523

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Infrared study of transition compound YbInCu4 using cleaved surfaces2007

    • Author(s)
      H.Okamura
    • Journal Title

      Physical Review B 第75巻・第1号

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Mid-infrared abosrptions in strongly-correlated Yb compounds2006

    • Author(s)
      H.Okamura
    • Journal Title

      Physica B 第378-380巻

      Pages: 756-756

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption2006

    • Author(s)
      H.Okamura
    • Journal Title

      Journal of Physical Society of Japan 第76巻・第2号

      Pages: 23703-23703

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Coupled charge-spin dynamics in the magnetoresistive pyrochlore Tl2Mn2O7 probed using ultrafast midinfrared spectroscopy2005

    • Author(s)
      R.P.Prasankumar
    • Journal Title

      Physical Review Letters 第95巻・第26号

      Pages: 267404-267404

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photoinduced spin crossover in Fe-picolylamine complex : A far-infrared study on single crystals2005

    • Author(s)
      H.Okamura
    • Journal Title

      Physical Review B 第72巻・第7号

      Pages: 73108-73108

    • NAID

      120000945261

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Indirect and direct energy gaps in Kondo semiconductor YbB122005

    • Author(s)
      H.Okamura
    • Journal Title

      J.Phys.Soc.Jpn. 第75巻・第7号

      Pages: 1954-1954

    • NAID

      130004539331

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Metal-insulator transition in PrRu4P12 and SmRu4P12 investigated by optical spectroscopy2005

    • Author(s)
      M.Matsunami
    • Journal Title

      Physical Review B 第72巻・第7号

      Pages: 73105-73105

    • Related Report
      2005 Annual Research Report
  • [Presentation] Infrared study of pressure-induced valence crossover in Yb2007

    • Author(s)
      H. Okamura
    • Organizer
      International Workshop for Infrared Microscopy and Spectroscopy with Accelerator Based Sources
    • Place of Presentation
      Awaji, Japan.
    • Year and Date
      2007-09-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Pressure study of pressure-induced valence crossover in Yb2007

    • Author(s)
      H. Okamura
    • Organizer
      International Workshop for Infrared Microscopy and Spectroscopy with Accelerator Based Sources
    • Place of Presentation
      Awaji, Japan
    • Year and Date
      2007-09-27
    • Related Report
      2007 Annual Research Report
  • [Presentation] INFRARED STUDY OF PRESSURE INDUCED VALENCE CROSSOVER IN Yb UP TO 18 GPa

    • Author(s)
      H. OKAMURA
    • Organizer
      INTERNATIONAL WORKSHOP ON INFRARED MICROSCOPY AND SPECTROSCOPY WITH ACCELERATOR BASED SOURCES
    • Place of Presentation
      AWAJI, JAPAN
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2005-04-01   Modified: 2020-05-15  

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