Growth and Tunneling Properties of (Bi, Pb)_2Sr_2CaCu_2O_y Single Crystals (Special Section on Superconducting Devices)

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概要

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• We have systematically grown and characterized (Bi, Pb)_2Sr_2CaCu_2O_y (BPSCCO) single crystals, and investigated the tunneling properties and the intrinsic Josephson effects of the single crystals as a function of the nominal composition of Pb, x. It was observed that Pb atoms (ions) were monotonically substituted for Bi atoms (ions) in the (Bi, Pb)-O layers of the crystals with increasing x in a region of 0≦x≦0.5, while the modulation structure was maintained in a range of 0≦ x<0.3, but disappeared in x≧0.3, accompanying the decrease of c-lattice parameter and T_c. Moreover, it was found that the energy gaps &lrtri; of BPSCCO depend hardly on x for x≦0.5, which are about 24 meV, so that the Pb-induced electronic change in the (Bi, Pb)-O layer do not perturb the electronic states in this superconducting system. And it was confirmed that the currentvoltage characteristics of the BPSCCO single crystals had multiple resistive branches corresponding to a series array of several hundreds Josephson junctions, and showed Shapiro steps and zero-crossing steps with the voltage separation of the order of m V resulting from the phase locking of about a hundred Josephson junctions among them under microwave irradiation. The estimated number of junctions gave the concept that the intrinsic Josephson junctions consist of the superconducting block layers and the insulating layers in the BPSCCO single crystals.

• 社団法人電子情報通信学会の論文
• 1994-08-25

著者

• Irie A

  Nagaoka Univ. Technology Niigata

• Irie A

  Utsunomiya Univ. Utsunomiya‐shi Jpn

• Oya Gin-ichiro

  The Faculty Of Engineering Utsunomiya University

• Irie Akinobu

  the Faculty of Engineering, Utsunomiya University

• Sakakibara Masayuki

  the Faculty of Engineering, Utsunomiya University

• Sakakibara Masayuki

  The Faculty Of Engineering Utsunomiya University

関連論文

• The Improvement of Compositional Distribution in Depth and Surface Morphology of YBa_2Cu_3O_<7-δ>-SrTiO_x Multilayers (Special Section on Superconducting Devices)
• Josephson Current in Microbridges of YBa_2Cu_3O_ Thin Films Prepared by CVD
• YBCO DC SQUID of MOCVD Thin Film Bridge
• Growth and Tunneling Properties of (Bi, Pb)_2Sr_2CaCu_2O_y Single Crystals (Special Section on Superconducting Devices)

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