Growth and high frequency properties of single-crystal whiskers of high T_ο superconductors

高T_ο超导体单晶须的生长及高频特性

• 批准号: 13650750
• 负责人: SATO Mitsunori
• 金额: $ 2.3万
• 依托单位: Kitami Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650750/
• 关键词: Whisker; Te dope; Bi-2212; Bi-2223; R-123; c axis; Intrinsic Josephson effect; Y-123; THz帯; Bi-2201; Whisker; Te dope; Bi-2212; Bi-2223; R-123; c axis; Intrinsic Josephson effect; Y-123; THz帯; Bi-2201

Recent attention has been on single crystal whiskers of high T_ο superconductors because of their useful characteristics such as perfect crystallinity, absence of dislocations, peculiar dimensions with extremely small cross sections, and excellent superconducting properties. Developments suggest that the high-T_ο whiskers are useful in the fabrication of electronic devices with high frequency THz band using intrinsic Josephson effects and related phenomena, such as Josephson plasma oscillations.Bi_2Sr_2CaCu_2O_χ (Bi-2212), (BiPb)_2Sr_2Ca_2Cu_3O_<10+δ> ((BiPb)-2223) and R_1Ba_2Cu_3O_χ (R-123)(R=Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu) single-crystal whiskers were grown from annealing sintered Te and Ca doped precursor pellets. The optimal precursor composition is Ca-rich Bi_2Sr_2Ca_2Cu_2Te_<0. 5>O_χ for Bi-2212, mixture of single-phase (BiPb)-2223 with 0.5TeO_2 for Bi-2223, and R_1Ba_2Cu_3Te_<0.5>Ca_<1.0>O_χ for R-123. The whiskers have excellent crystallinity with contain no Te element, and exhibit interesting intrinsic Josephson effects along the c axis.

最近关注的是高T_软导体的单晶晶须，因为它们的有用特征，例如完美的结晶度，缺口缺失，具有极小横截面的特殊尺寸以及出色的超导性能。 Developments suggest that the high-T_ο whiskers are useful in the fabrication of electronic devices with high frequency THz band using intrinsic Josephson effects and related phenomena, such as Josephson plasma oscillations.Bi_2Sr_2CaCu_2O_χ (Bi-2212), (BiPb)_2Sr_2Ca_2Cu_3O_<10+δ> （（（BIPB）-2223）和R_1BA_2CU_3O_χ（R-123）（r = y，la，nd，sm，sm，eu，gd，gd，gd，ho，ho，ho，ho，ho，ho，tm，yb和lu）单晶晶须是由于退火而享受的Te和Ca ca te te和Ca ca ca te和co ca而生长的。最佳前体组成是富含CA的BI_2SR_2CA_2CU_2TE_ <0。 5>o_χ的BI-2212，单相（BIPB）-2223与BI-2223的0.5TEO_2的混合物，R_1BA_2CU_3TE_3TE_ <0.5> ca__ <1.0> ca_ <1.0> o_ub for R-123。晶须具有出色的结晶度，没有TE元素，并且在C轴上表现出有趣的内在约瑟夫森效应。