• 제목/요약/키워드: MgO bicrystal Josephson junction

검색결과 6건 처리시간 0.015초

Polyvinylidene Fluoride를 게이트 전극으로 이용한 MgO bicrystal Josephson junction의 전기 특성 및 마이크로파 특성 연구 (Electrical Characteristics and Microwave Properties of MgO Bicrystal Josephson Junction with Polyvinylidene Fluoride Gate Electrode)

  • 윤용주;김형민;박광서;김진태
    • Progress in Superconductivity
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    • 제3권1호
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    • pp.74-77
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    • 2001

  • We have fabricated a high-Tc superconductive transistor with polyvinylidene fluoride (PVDF) gate electrode on MgO bicrystal Josephson junction by spin-coating method. The PVDF ferroelectric film is found to be suitable fur a gate electrode of the superconductive transistor since it has not only small leakage current but also high dieletric constant at low temperature. For the application of superconducting-FET, we investigated millimeter wave properties (60 GHz band) of the Josephson junction with PVDF gate electrode.

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조셉슨 접합의 샤피로 계단특성에 대한 부가저항의 효과 (Effect of an additional resistance on Shapiro steps of the Josephson junction)

  • 심우석;조원일;송이헌;김도현;박광서;송인상
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 1999년도 High Temperature Superconductivity Vol.IX
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    • pp.223-228
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    • 1999

  • We have investigated the microwave properties of a high-T$_c$. superconducting Josephson junction by Shapiro step measurements. A Josephson junction was fabricated on the bicrystal MgO substrate using pulsed laser deposition method. We have measured Shapiro steps in the I-V characteristics under the irradiation of 1.36 cm wavelength up to 45 K and found inclined current steps above 50 K. In order to understand these results, we introduced an additional resistance connected in series to RSJ model. Using this modified RSJ model, we could explain the inclined current steps as a result of superposition of the junction and an additional resistance above certain temperatures. Also, we presented the received power of the Josephson junction above 50 K.

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