RBa_2Cu_3O_x单晶晶须的生长及其各向异性
Growth and Anisotropic Properties of RBa_2Cu_3O_x Single-Crystal Whiskers
摘要：
以Sb、Te掺杂的R1.5Ba2.75-3.00Cu3M0.5Ox（M：Sb，Te）前驱体为原料，成功地生长出RBa 2Cu 3 Ox（R-123，R = Sm，Eu，Gd，Dy，Ho，Er，Tm，Yb，Y）单晶晶须。晶须平行于ab平面生长，具有以下典型尺寸：长度为2-8 mm，宽度为20-80 \mum，厚度为10-30 \mum。在具有小离子半径（Dy、Ho、Er、Tm、Yb和Y）的稀土离子（R3+）的情况下，从Te掺杂的前体生长R-123晶须。用掺Te和掺Sb的前驱体证实了Y-123和Ho-123晶须的生长。另一方面，对于具有大离子半径（Sm、Eu和Gd）的稀土离子（R3+），仅从Sb掺杂的前体生长R-123晶须。Sb和Te没有检测到在生长的晶须通过电子探针显微分析。根据不同磁场下R-123单晶晶须的磁电阻率随角度的变化关系，估算了其磁电阻率的各向异性为6.0-33。各向异性随超导转变温度的降低而增大。
英文摘要：
Single-crystal whiskers of RBa2Cu3Ox (R-123, R = Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y) were successfully grown from Sb- or Te-doped precursors with a nominal composition of R1.5Ba2.75-3.00Cu3M0.5Ox (M: Sb,Te). The whiskers were grown parallel to the ab-plane with the following typical dimensions: 2-8 mm in length, 20-80 \mum in width, and 10-30 \mum in thickness. In the case of rare-earth ions (R3+) with a small ionic radius (Dy, Ho, Er, Tm, Yb, and Y), R-123 whiskers were grown from Te-doped precursors. The growths of Y-123 and Ho-123 whiskers were confirmed using both Te-doped and Sb-doped precursors. On the other hand, for rare-earth ions (R3+) with a large ionic radius (Sm, Eu, and Gd), R-123 whiskers were grown only from Sb-doped precursors. Sb and Te were not detected in the grown whiskers by electron probe microanalysis. The anisotropies of R-123 single-crystal whiskers in the flux liquid state were estimated to be 6.0-33 from the angular dependence of their resistivities under various magnetic fields. The anisotropy increased with decreasing superconducting transition temperature.
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