Record Details

Title:
Josephson lattice model for phase fluctuations of local pairs in copper oxide superconductors
Affiliation(s):
EuXFEL guest, Other
Author group:
Theory
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Abstract:
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 $d_x2−_y2$ -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 $YBa_2$ $Cu_3$ $O_7−x$ .
Imprint:
American Physical Society, 2019
Journal Information:
Physical Review B, 100 (2), 024510 (2019)
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Language(s):
English
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