Coupling Transition of the Vortex Liquid in Bi 2 Sr 2 CaCu 2 O 8 + δ with Columnar Defects
Coupling Transition of the Vortex Liquid in Bi 2 Sr 2 CaCu 2 O 8 + δ with Columnar Defects
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Bi 2 Sr 2 CaCu 2 O 8 + δ中涡流液体与柱状缺陷的耦合转变
DOI：
10.1103/physrevlett.79.3763
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发表时间：
1997
影响因子：
8.6
通讯作者：
K. Kumagai
中科院分区：
文献类型：
--
作者：
M. Kosugi;Y. Matsuda;M. Gaifullin;L. Bulaevskii;N. Chikumoto;M. Konczykowski;J. Shimoyama;K. Kishio;Kazuto Hirata;K. Kumagai
用约瑟夫森等离子体共振方法研究了重离子辐照${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$涡旋流体相中的层间约瑟夫森耦合。柱状缺陷的引入极大地改变了涡旋液体的性质。我们发现在辐照后的晶体中出现了两种涡旋液体，即完全耦合的涡旋液体和去耦合的煎饼涡旋液体。与原始晶体相反的是，薄煎饼旋涡倾向于随着磁场的增加而耦合。在远高于不可逆线的较窄温度范围内，双共振峰作为场的函数出现。这意味着在液相中发生了耦合相变。
The interlayer Josephson coupling in the vortex fluid phase of heavy-ion irradiated ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ is probed by Josephson plasma resonance. The introduction of columnar defects changes the nature of the vortex liquid dramatically. We show that two types of vortex liquid, the well-coupled and the decoupled pancake vortex liquids, appear in the irradiated crystals. The pancake vortices tend to couple with increasing magnetic field, which is opposite to the pristine crystal. The double resonance peaks appear as a function of field in a narrow temperature range well above the irreversibility line. This implies an occurrence of the coupling transition in the liquid phase.