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Temperature dependence of the total nonlinear coefficient for (solid line). The two contributions from the -band and the -band are shown as the dashed and dashed–dotted line, respectively.
Temperature dependence of the intrinsic nonlinear coefficient for , for a -wave superconductor with (YBCO, dashed line), and a hypothetical BCS single gap superconductor with (dashed–dotted line).
Temperature dependence of in the clean (solid line) and dirty limit. In the dirty limit depends on the relative scattering rates in the two bands of . Results are shown for (dotted), 1 (dashed–dotted), and 2 (dashed).
Dependence of on ratio at a fixed temperature of . For , the nonlinear response is dominated by the -band, while for the -band dominates.
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