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2002 Fiscal Year Final Research Report Summary

Electronic Phases in Low-Dimensional Electron Systems under Ultra-High Magnetic Fields

Research Project

Project/Area Number 12440083
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionThe University of Tokyo

Principal Investigator

OSADA Toshihito  Institute for Solid State Physics, Associated Professor, 物性研究所, 助教授 (00192526)

Co-Investigator(Kenkyū-buntansha) MATSUDA Yasuhiro  Department of Physics, Okayama University, Associated Professor, 理学部(平成14年4月物性研究所・助手より異動), 助教授 (10292757)
MIURA Noboru  Institute for Solid State Physics, Professor, 物性研究所, 教授 (70010949)
OHMICHI Eiji  Institute for Solid State Physics, Research Associate, 物性研究所, 助手 (00323634)
Project Period (FY) 2000 – 2002
Keywordsmagnetoresistance / ultra-high magnetic field / low-dimensional electron system / semimetal / charge density wave / magnetic breakdown / two-dimensional electron system / fractional quantum Hall effect
Research Abstract

The purpose of this work is to find and to clarify new electronic phases which appear in low-dimensional electron systems under ultra-high magnetic fields beyond 100T. In the present work, we have tried to measure electric conduction under pulsed ultra-high magnetic fields with the width of several us, which have been generated by the electromagnetic flux compression method or the single-turn-coil direct discharge method. In order to overcome the experimental difficulties of huge induced voltage, huge discharge noise, and sample heating due to eddy current, we have developed techniques for RF transport measurement and microfabrication of samples.
1. Electron Correlation under Ultra-High Magnetic Fields
High-field magnetotransport measurements for graphite and bismuth have revealed that the posions of the Shubnikov-de Haas oscillations near the high-magnetic-field quantum limit deviate from those expected from low-field oscillations. This fact strongly suggests that the self energy correc … More tion due to electron correlation is enhanced at high-field quantum limit where the electron orbit becomes smaller than the electron distance.
2. Bloch Electron Systems under Ultra-High Magnetic Fields
In quasi-one-dimensional conductor NbSe_3 which shows double Peierls transitions, one small thin electron pocket remains at the low-temperature phase. We have found that the magnetoresistance monotonously decreases in the high-field quantum limit where all electrons lie in the lowest Landau level. This anomalous behavior reflects the Harper broadening of the lowest Landau level due to the magnetic breakdown across the CDW gap.
3. Two-Dimensional Electron System under Ultra-High Magnetic Fields
In order to investigate the high-field phases in quantum Hall systems, we have developed the techniques for RF transport measurement in quantum Hall systems whose impedance oscillates between zero and high resistance. We have fabricated the Corbino samples with special shape, and have succeeded to measure σ_<xx>Ck up to 100T. A structure corresponding to the 1/3 fractional Hall state was observed about at 80T. Less

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] M.Saito: "Transport Measurement of α-(BEDT-TTF)_2KHg(SCN)_4 in Ultra-High Magnetic Fields beyond 150T"Synthetic Metals. 135-136. (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Saito: "Transport Measurements for Low-Dimensional Conductors under Ultra-High Magnetic Fields Beyond 100T"Synthetic Metals. 133-134. 133-135 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Osada: "General Quantum Picture for Magnetoresistance Angular Effects in Quasi-One-Dimensional Conductors"Synthetic Metals. 133-134. 75-77 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshihito Osada: "Resonant Tunneling Tuned by Magnetic Field Orientations in Anisotropic Multilayer Systems"Physica E. 12. 272-275 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Koshino: "Hofstadter Butterfly and Integer Quantum Hall Effect in Three Dimensions"Physical Review Letters. 86. 1062-1065 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Osada: "Angular Dependent Phenomena in Low-Dimensional Conductors under High Magnetic Fields"Physica B. 294-295. 402-407 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Saito, T. Osada, T. Inokuchi, E. Ohmichi, T. Ikaida, S. Ikeda, Y. H. Matsuda, K. Uchida, and N, Miura: "Transport Measurement of α-(BEDT-TTF)_2KHg(SCN)_4 in Ultra-High Magnetic Fields beyond 150T"Synthetic Metals. 135-136 to be published. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Saito, T. Inokuchi, E. Ohmichi, K. Uchida, and T. Osada,: "Transport Measurements for Low-Dimensional Conductors under Ultra-High Magnetic Fields Beyond 100T"Synthetic Metals. 133-134. 133-135 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Osada and M. Kuraguchi: "General Quantum Picture for Magnetoresistance Angular Effects in Quasi-One-Dimensional Conductors"Synthetic Metals. 133-134. 75-77 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Kobayashi, E. Ohmichi, and T. Osada: "Electric Field Effect on Magnetoresistance Angular Effects in Low-Dimensional Organic Conductors"Synthetic Metals. 133-134. 71-73 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kuraguchi, E. Ohmichi, T. Osada, and Y. Shiraki: "Relationship Between Stark-Cyclotron Resonance and Angular Dependent Magnetoresistance Oscillations"Physica. E12. 264-266 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshihito Osada: "Resonant Tunneling Tuned by Magnetic Field Orientations in Anisotropic Multilayer Systems"Physica. E12. 272-275 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Koshino, H. Aoki, and T. Osada: "Field-Induced Spin-Density-Wave and Butterfly Spectrum in Three Dimensions"Physical Review. B65. 205-311 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Koshino, H. Aoki, K. Kuroki, S. Kagoshima, and T. Osada: "Hofstadter Butterfly and Integer Quantum Hall Effect in Three Dimensions"Physical Review Letters. 86. 1062-1065 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Osada, H. Nose, and M. Kuraguchi: "Angular Dependent Phenomena in Low-Dimensional Conductors under High Magnetic Fields"Fhysica. B294-295. 402-407 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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