Successive phase transitions of a hierarchical nature in a YBa2Cu4O8 ceramic superconductor
Successive phase transitions of a hierarchical nature in a YBa2Cu4O8 ceramic superconductor
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YBa2Cu4O8 陶瓷超导体中分级性质的连续相变
DOI：
10.1143/jpsj.63.3405
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发表时间：
1994
影响因子：
1.7
通讯作者：
M. Matsuura
中科院分区：
文献类型：
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作者：
M. Kawachi;M. Hagiwara;K. Koyama;M. Matsuura
通过弱磁场下的系统直流磁测量研究了具有单相和均匀亚微米尺寸晶粒的YBa 2 Cu 4 O 8 陶瓷的超导有序性。分级性质的连续相变被确定在两个温度 T C1 (≃ 80 K) 和 T C2 (≃ 37 K) 下发生。 T C1 处的转变是从正常状态到晶粒内超导状态的转变。 T C2 处的转变是进入晶粒间超导状态的转变，并导致整个样品上形成无限的超导网络。考虑到可能的约瑟夫森结型耦合，推测 T C2 处的第二次转变是超导晶粒之间的长程有序，类似于三维 XY 铁磁体。
The superconductive ordering of a YBa 2 Cu 4 O 8 ceramic with a single phase and of homogeneous sub-micron size grains, is studied by systematic DC magnetic measurements under weak magnetic fields. Successive phase transitions of a hierarchical nature are identified to occur at two temperatures T C1 (≃ 80 K) and T C2 (≃ 37 K). The transition at T C1 is that from the normal into the intra-grain superconductive state. The transition at T C2 is that into the inter-grain superconductive state and results in an infinite superconductive network over the whole sample. Taking a possible Josephson junction type coupling into account, the second transition at T C2 is speculated to be a long range ordering among the superconductive grains and similar to that for a three-dimensional XY ferromagnet.
DOI：
10.1007/bf01303701
发表时间：
1986-01-01
期刊：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
影响因子：
--
作者：
BEDNORZ, JG;MULLER, KA
通讯作者：
MULLER, KA