Superconducting junctions using AlGaAs/GaAs heterostructures with high Hc2 NbN electrodes

Hideaki Takayanagi, Tatsushi Akazaki, Minoru Kawamura, Yuichi Harada, Junsaku Nitta

研究成果: Contribution to journalConference article査読

7 被引用数 (Scopus)


We investigated a superconductor-semiconductor-superconductor junction formed by two superconducting NbN electrodes and a two-dimensional electron gas (2DEG) in an AlGaAs/GaAs heterostructure. We obtained a good ohmic contact between NbN/AuGeNi electrodes and 2DEG by annealing them at 450 °C for 1 min in an N2 atmosphere. We observed a decrease in the resistance caused by Andreev reflection (AR) within the superconducting energy gap voltage in a zero magnetic field in this structure. We found that the peculiar features of the magnetoresistance in the transition region can be qualitatively explained by considering the existence of the AR in high magnetic fields.

ジャーナルPhysica E: Low-Dimensional Systems and Nanostructures
出版ステータス出版済み - 1 1 2002
イベント14th International Conference on the - Prague, チェコ共和国
継続期間: 7 30 20018 3 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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