Growth and superconductivity of Bi2.1Sr1.9Ca1.0(Cu1−yFey)2Ox single crystal
Growth and superconductivity of Bi2.1Sr1.9Ca1.0(Cu1−yFey)2Ox single crystal
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DOI：
10.1016/0022-0248(94)90986-5
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发表时间：
1994-04
影响因子：
1.8
通讯作者：
G. Gu;K. Takamuku;N. Koshizuka;Shōji Tanaka
中科院分区：
文献类型：
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作者：
G. Gu;K. Takamuku;N. Koshizuka;Shōji Tanaka
用浮区法（FZM）在Bi[sub 2.1]Sr[sub 1.9]Ca[sub 1.0]（Cu[sub 1-y]Fe[sub y]）[sub 2]O[sub x]（y <= 0.03）棒中生长了Fe取代的Bi-2212单晶。棒中Fe的替代降低了Bi-2212晶体的生长稳定性，从而减小了晶体的尺寸。从y=0的棒生长的单晶沿c轴的最大厚度沿着为2 mm，但y=0.03时仅为0.4 mm。所生长晶体的最大Fe溶解度极限小于0.03at%。晶体中的Fe替代不仅使超导转变温度急剧下降，而且使超导相的均匀性也急剧下降。对于w=0-0.01的生长态晶体，T[sub c]随晶体中实际Fe取代含量w的降低速率高达16.7 K/（Fe/（Cu+Fe））at%，而对于w =0.01-0.022的生长态晶体和w=0-0.022的退火晶体，T[sub c]随晶体中实际Fe取代含量w的降低速率仅为7.3 K/（Fe/（Cu+Fe））at%
Fe-substituted Bi-2212 single crystals in rods of Bi[sub 2.1]Sr[sub 1.9]Ca[sub 1.0](Cu[sub 1-y]Fe[sub y])[sub 2]O[sub x] with y[<=]0.03 have been grown successfully by the floating zone method (FZM). Fe substitution in the rods depresses the growth stability of Bi-2212 crystals and consequently reduces the size of the crystals. The maximum thickness along the c-axis of the single crystals grown from a rod with y=0 is as large as 2 mm, but only 0.4 mm for y=0.03. The maximum Fe solubility limit of the as-grown crystals is less than 0.03 at%. Fe substitution in the crystals decreases sharply not only the superconducting transition temperature, but also the homogeneity of the superconducting phase. The rate of T[sub c] decrease with actual Fe-substituted content w in the crystals is as high as 16.7 K/(Fe/(Cu+Fe)) at% for the as-grown crystals of w=0-0.01, but only 7.3 K/(Fe/(Cu+Fe)) at% for the as-grown crystals of w=0.01-0.022 and the annealed crystals of w=0-0.022