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ESR and Cyclotron Resonance of Strongly Correlated Materials

Research Project

Project/Area Number 08404022
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTohoku University

Principal Investigator

MOTOKAWA Mitsuhiro  Institute for Materials Research, Tohoku University, Professor, 金属材料研究所, 教授 (30028188)

Co-Investigator(Kenkyū-buntansha) OHTA Hitoshi  Faculty of Science, Kobe University, Associate Professor, 理学部, 助教授 (70194173)
KOYAMA Kei-ichi  Institute for Materials Research, Tohoku University, Research Associate, 金属材料研究所, 助手 (70302205)
TAKUO Sakon  Institute for Materials Research, Tohoku University, Research Associate, 金属材料研究所, 助手 (80271964)
ラニエロ ピッティーニ  東北大学, 金属材料研究所, 助手 (30271985)
鈴木 孝  東北大学, 大学院・理学研究科, 教授 (30004344)
光藤 誠太郎  東北大学, 金属材料研究所, 助手 (60261517)
Project Period (FY) 1996 – 1999
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥39,800,000 (Direct Cost: ¥39,800,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1997: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1996: ¥29,800,000 (Direct Cost: ¥29,800,000)
Keywordsheavy-electron systems / cyclotron resonance / magnetic resonance / CoS_2 / low-carrier systems / GdAs / COS_2 / Yb_4(As_<0.60>P_<0.40>)_3 / Yb_4(As_<0.71>Sb_<0.29>)_3 / 少数キャリヤ-系 / 電子スピン共鳴
Research Abstract

Continuing the experiments done last year, we have performed the magnetic resonance and cyclotron resonance on some rare-earth compounds using vector network analyzer system developed recently at ultra low temperatures and high magnetic fields. A microwave cavity has been used for high sensitivity. The frequency range is 40〜110 GHz and the temperature range is 0.5〜300 K. The obtained results are as follows :
1) GdAs : The magnetic structure of this compound with easy (111) plane, which had been unknown so far, has been determined by ESR. The cyclotron resonance has been observed at 0.5 K and the effective mass of the carrier is detemined as 0.48 m0. This result suggests that the fermi surface is spherical and the effective mass is two times larger than that obtained by quantum oscillation.
2) LaSb : The cyclotron resonance has been observed below 4.2 K. From the anisotropic behavior of the resonance position, this resonance occurs due to carriers with a ellipsoidal fermi surface. The effective mass obtained is 0.26 m0 along the <100> direction and is two times larger than that obtained by quantum oscillation.
The difference between masses obtained by cyclotron resonance and quantum oscillaation has been observed for low dimensional organic conductors. However the former is larger than the latter and consistent with the theoretical prediction, which is against our result. In this study, we have first observed the cyclotron resonance on strongly correlated materials, which has never reported, and determined the effective mass directly. The theory to explain our result has not been done yet.

Report

(5 results)
  • 2001 Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] K.Koyama: "Magnetic resonance of GdAs"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Koyama: "Ant ferromagnetic resonance and magnetic structure of GdAs"J. Phys. Soc. Jpn. (to be published). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Sakon: "dHvA effect and magnetic resonance of GdAs"J JAP. (to be published). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Koyama et al.: ""Magnetic resonance of GdAs""Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Koyama et al.: ""Antiferromagnetic resonance and magnetic structure of GdAs""J. Phys. Soc. Jpn.. (to be published). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Sakon et al.: ""dHvA effect and magnetic resonance of GdAs""JJAP. (to be published). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Koyama: "Magnetic resonance of GdAs"Physica B. (inpress). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Koyama: "Antiferromagnetic resonance and magnetic structure of GdAs (to be published)"J.Phys.Soc.Jpn. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Sakon: "dHvA effect and magnetic resonance of GdAs"JJAP. 135-137 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Ohta: "Spectroscopic Study of Kondo Insulator YbB12 Using the Free Electron Laser" J.Magn.Magn.Mater. 177-181. 341-342 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Mitsudo: "Submillimeter Wave ESR Measurement of LaMnO_3" J.Magn.Magn.Mater. 177-181. 877-878 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Takahashi: "Magnetic and Structural Phase Transition in Heavy Rave Earth Compound DyB6" Physica B. 241-243. 696-698 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Akioka: "Fermi Surface Study of a-(BEDT-TTF)2MHg(SCN)4 by Cyclotron Resonance Measurement" Physica B. 246-247. 311-314 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Pittini: "Cyclotron Resonance Experiments in Y64(As0.6P0.4)3 and Y64(As0.71Sb0.29)3" Physica B. 246-247. 452-455 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Fukuda: "Submillimeter Wave ESR Study on Triangular Lattice Antiferromagnet CuFeO_2" Physica B. 246-247. 569-571 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Pittini, H.Nojiri, M.Motokawa A.Odiai, T.Sazuki: "Cyclotron resonance enperiments in Yb_4(As_<0.6>P_<0.4>)_3 and Yb_4(As_<0.71>Sb_<0.79>)_3" Plysica B. (未定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] M. Arai: "Quantum Spin Excitations in the Spin-Peierls System CuGeO_3" Phys. Rev. Lett.77・17. 3649-3652 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S. Kimura: "Submillimeter-Wave Electron Spin-Resonance Measurements for Single-Crystal Y_2Cu_2O_5" J. Phys : Condens. Matter. 8. 5461-5473 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N. Kitamura: "Magnetic Relaxation of Spins in CaO-P_2O_5 System" Physica B. 219Z220. 112-114 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M. Motokawa: "Cu-Ag Alloy Bitter Type Magnet for Repeating Pulsed Field" IEEE Trans. on Mag.32・4. 2534-2537 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S. Kimura: "Submillimeter Wave ESR Measurements of Metamagnetic Y_2Cu_2O_5" Int. Journal of Infrared and Millimeter Waves. 17・5. 833-841 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H. Ohta: "High Field ESR of Kagome Antiferromagnets SrCr_xGa_<12-x>O_<19>" J. Phys. Soc. Jpn. 65・3. 848-852 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2020-05-15  

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