Growth and superconducting properties of Bi2Sr2CaCu2O8+δ single-crystal whiskers using tellurium-doped precursors
Growth and superconducting properties of Bi2Sr2CaCu2O8+δ single-crystal whiskers using tellurium-doped precursors
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碲掺杂前驱体 Bi2Sr2CaCu2O8+δ 单晶须的生长和超导性能
DOI：
10.1063/1.1401784
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发表时间：
2001
影响因子：
4
通讯作者：
T. Yamashita
中科院分区：
文献类型：
--
作者：
M. Nagao;Mitsunori Sato;H. Maeda;Sang‐Jae Kim;T. Yamashita
Bi2Sr2CaCu2O8+δ(Bi2212)单晶晶须的生长是通过未经过熔融玻璃态的Te掺杂的Bi2Sr2CaCu2O8+Bi2212前驱体的热处理过程来实现的。前驱体的最佳名义组成为富钙Bi2Sr2Ca2Cu2Te0.5Ox，Te含量为0.5。晶须中不含Te元素。前驱体主要由Bi2212和(SrCa)3TeO6(STO)相组成。STO或Te元素在促进晶须生长方面起到催化剂的作用。由本征约瑟夫森结引起的电流-电压特性的多分支结构的临界电流(IC)沿c轴相当均匀，表明晶须是均匀的，质量很好。
Bi2Sr2CaCu2O8+δ (Bi2212) single-crystal whiskers were grown by annealing sintered Te-doped Bi–Sr–Ca–Cu–O precursors that had not passed through a melt-quenched glassy state, a process that is known well at this time. The optimum nominal composition of precursors is Ca-rich Bi2Sr2Ca2Cu2Te0.5Ox with a Te content of 0.5. The whiskers contain no Te element. The precursors are mainly composed of Bi2212 and (SrCa)3TeO6 (STO) phases. The STO or the element Te acts as a catalyst in enhancing whisker growth. The critical current (Ic) with a multibranched structure of the current–voltage characteristics due to the intrinsic Josephson junctions along the c axis is quite uniform, showing that the whiskers are homogeneous and of good quality.