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1998 Fiscal Year Final Research Report Summary

SCANNING SET TRANSISTOR MICROSCOPE

Research Project

Project/Area Number 09640419
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

YAGI Ryuta  THE UNIVERSITY OF TOKYO,GRADUATE SCHOOL OF SCIENCE,RESEARCH ASSOCIATE, 大学院・理学系研究科, 助手 (60251401)

Project Period (FY) 1997 – 1998
KeywordsMQT / Energy Dissipation / Shunt Resistor / Tunneling Resistor / S-I Transition
Research Abstract

We studied the effect of energy dissipation on macroscopic quantum tunneling (MQT) in single small Josephson junction. We succeeded in observing dissipative phase transition. Energy dissipation was tuned by attaching a resistor at the very vicinity of small Josephson junction. Here we kept the normal state tunneling resistance of Josephson larger than the quantum resistance, and varied the resistance of the attached resistor. In case of Ohmic shunt resistor made of nickel chromium alloy, the Josephson junction that exhibits insulating behavor recovers superconductivity when the shunt resistance Rs was less than the quantum resistance Rq=h/4e2. On the other hand, when Rs > Rq, it was insulating. We determined the phase diagram for superconductor-insulator transition by varying EJ/EC values. The case of tunneling resistance was also studied. A normal small tunneling junction was connected to a small Josephson junction in parallel. The ohmic shunt resistor and the tunneling junction have different types of energy dissipation in that the charge transfer in the former case is continuous while in the latter discrete. In a theoretical prediction, the phase diagrams for the S-I transition are different between these two. In preliminary experiments, the tunneling junction acted quite similarly to the ohmic shunt resistance.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] R.Yagi, S.Kobayashi, Y.Ootuka: "Pissipative Hoase Transition in Single Small-Josephson Junction with Normal Tunneling Junction" J.Phys.Soc.Jpn.4(印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Yagi, S.Kobayashi: "The Eeffect of Shunt Resistor on Superconductor-Insulator Transition in Single Small Josephson Junction" Solid State Electronics. 42. 1477-1480 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Yamaguchi, R.Yagi, S.Kobayashi and Y.Ootuka: "Two Pimonsional Arrays of Small Josephson Junctions with Regular and Random Defects" J.Phys.Soc.Jpn.66. 729-731 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Yagi, S.Kobayashi, and Y.Ootuka: "Dissipative Phase Transition Single Small Josephson Junction with Normal Tunneling Junction" J.Phys.Soc.Jpn.No.4 (in Press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Yagi and S.Kobayashi: "The Effect of Shunt Resistor on Superconductor-Insulator Transition in Single Small Josephson Junctions" Solid State Electronics. 42. 1477-1480 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Yamaguchi, R.Yagi, S.Kobayashi, and Y.Ootuka: "Two-Dimensional Arrays of Small Josephson Junctions with Regular and Random Defects" J.Phys.Soc.Jpn.66. 729-731 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Yagi and S.Kobayashi: "Tuning of Superconductor-Insulator Transition in Single Small Josephson Junctions with Shunt Resistor" J.Phys.Soc.Jpn.66. 3360-3362 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Yagi and S.Kobayashi: "Phase Diagram for Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resistor" J.Phys.Soc.Jpn.66. 3722-3724 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kazawa, R.Yagi K.Ono, Y.Ootuka and S.Kobayashi: "Chemical Potential Dependence of Resistance of Two-Dimensional Array of Small Tunnel Junctions" J.Phys.Soc.Jpn.66. 276-277 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kazawa, R.Yagi K.Ono, Y.Ootuka and S.Kobayashi: "Chemical Potential Dependence of Resistance of Two-Dimensional Array of Small Tunnel Junctions" Jpn.J.Appl.Phys.36. 4020-4021 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Yagi, T.Yamaguchi, H.Kazawa and S.Kobayashi: "Phase Diagram for Superconductor-Insulator Transition in Two-Dimensional Arrays of Small Josephson Junctions" J.Phys.Soc.Jpn.66. 2429-2436 (1997)

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

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Published: 1999-12-08  

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