Josephson lattice model for phase fluctuations of local pairs in copper oxide superconductors

Josephson lattice model for phase fluctuations of local pairs in copper oxide superconductors
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氧化铜超导体局部对相位涨落的约瑟夫森晶格模型

DOI:
10.1103/physrevb.100.024510
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
M. Katsnelson
M. Katsnelson
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Harland;Sergey Brener;A. Lichtenstein;M. Katsnelson

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我们从微观哈伯德模型中推导出有效约瑟夫森耦合的表达式。它是在有效 $XY$ 斑块模型(约瑟夫森晶格)框架内描述 $d_{x^2-y^2}$ 波超导体中局域库珀对相位涨落的起点。有效相互作用的表达式是通过局部力定理导出的,它取决于我们使用簇动态平均场理论获得的局部对称破缺相关函数。此外,我们将连续统极限应用于约瑟夫森晶格,以获得Ginzburg-Landau理论中梯度项的表达式,并将预测的伦敦穿透深度和Kosterlitz-Thouless转变温度与YBa$_2$Cu$_3$O$_{7-x}$的实验数据进行比较。
We derive an expression for the effective Josephson coupling from the microscopic Hubbard model. It serves as a starting point for the description of phase fluctuations of local Cooper pairs in $d_{x^2-y^2}$-wave superconductors in the framework of an effective $XY$ model of plaquettes, the Josephson lattice. The expression for the effective interaction is derived by means of the local-force theorem, and it depends on local symmetry-broken correlation functions that we obtain using the cluster dynamical mean-field theory. Moreover, we apply the continuum limit to the Josephson lattice to obtain an expression for the gradient term in the Ginzburg-Landau theory and compare predicted London penetration depths and Kosterlitz-Thouless transition temperatures with experimental data for YBa$_2$Cu$_3$O$_{7-x}$.
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发表时间: 2018-02
影响因子: 8.6
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