• 제목/요약/키워드: Josephson tunneling

검색결과 19건 처리시간 0.033초

Effect of spin-polarized current injection on pair tunneling properties of $Bi_2$$Sr_2$Ca$Cu_2$$O_{8+x}$ intrinsic Josephson junctions

  • Shin, Ho-Seop;Lee, Hu-Jong;Do Bang;Nguyen Khac Mac
    • Progress in Superconductivity
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    • 제5권1호
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    • pp.5-8
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    • 2003

  • We studied the effect of spin injection on tunneling conduction properties of intrinsic Josephson junctions formed in $Bi_2$$Sr_2$$CaCu_2$$O_{ 8＋x}$ single crystals. properties of an identical stack (10${\times}$5.0${\times}$0.030 $\mu\textrm{m}^3$) of intrinsic Josephson junctions were compared for the bias current injected through Au and Co electrodes. The suppression of the superconducting gap in the $_2$ double layers and the interlayer Josephson critical current was manifested in the tunneling current-voltage characteristics of the stacks. This effect appears to be caused by the pair breaking associated with spin-polarized carriers injected from the Co electrode into the $Bi_2$$Sr_2$$_2$O$CaCu_{ 8＋x}$ single crystal. This study may provide valuable information on clarifying the mechanism of high- $T_{c}$ superconductivity.y.y.

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Josephson Tunneling and Pairing Symmetry of High Tc Superconductor

  • Shin, E.J.;Nahm, Kyun;Chung, M.H;Kim, M.D.;Kim, C.K.;Noh, H.S.
    • Progress in Superconductivity
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    • 제1권2호
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    • pp.85-88
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    • 2000

  • The temperature dependent Josephson critical current $J_c(T)/J_c(0)$ between high $T_c$ superconductors along the a-axis is theoretically studied. The interface influence on the wave functions of quasi-particles is included in the theory within the framework of the two-dimensional t-J model. It is found that the experimental results can be satisfactorily explained by the present model with d wave pairing symmetry.

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Applications of Small Josephson Junctions

  • Kim, Nam;Kim, Ji-Nee;Hansen, Klavs;Toppari, Jussi;Paraoanu, Sorin;Pekola, Jukka
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 2003년도 High Temperature Superconductivity Vol.XIII
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    • pp.10-10
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    • 2003

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Oscillatory Josephson-Vortex Resistance in Stacks of $Bi_{2}Sr_{2}CaCu_{2}O_{8+x}$ Intrinsic Josephson Junctions

  • 최재현;배명호;이후종;김상제
    • Progress in Superconductivity
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    • 제7권1호
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    • pp.17-21
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    • 2005

  • We report the oscillation of the Josephson vortex-flow resistance in the rectangular stacks of $Bi_{2}Sr_{2}CaCu_{2}O_{8+x}$(Bi-2212) intrinsic Josephson junctions (IJJs). Apiece of Bi-2212 single crystal containing a few tens of IJJs was sandwiched between two gold electrodes and fabricated into a rectangular shape with the typical lateral size of about $1.5{\times}10\;{\mu}m^2$, using e-beam lithography and focused ion-beam etching techniques. In a tesla-range magnetic field applied in parallel with the junction planes, the oscillation of the Josephson vortex flow resistance was observed at temperatures near 60 K. The oscillation results from the interplay between the triangular Josephson vortex lattice and the potential barrier at the boundary of a single crystal. The oscillatory magnetoresistance for different bias currents, external magnetic fields, and the tilt-angles provides useful information on the dynamics of the coupled Josephson-vortex lattice system.

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