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Tunneling spectrum versus of a YBCO break junction at (solid line). The dashed line near was drawn by hand. The Josephson peak (width ) is superposed on the double-peak structure . shows the position (from ) of the peak on the double peak structure. To understand the relative intensity of the peaks see Fig. 4. Inset: magnetic field dependence of the zero-bias conductance. The external field was applied parallel to the -axis. The dependence is similar for opposite directions of the applied field.
Temperature dependence of normalized tunnel conductance at low temperatures. Thick line—; dotted line—; dashed line—. The normalization of is performed for at . The fine dashed line is the inferred background conductance (see text). Left-hand inset: comparison of calculated tunneling conductance of an –– junction for node direction tunneling and for the and order parameters.5 Bath temperature . . Right-hand inset: calculated –– junction tunneling conductance for the state for node direction tunneling.5 , 0.10, 0.12, and 0.13 from the bottom. .
Effect of a magnetic field on the tunnel conductance.
Temperature dependence of the tunneling spectrum versus . The curves at have been successively shifted along the voltage bias (with a step) and conductance axes (along the fine solid line). The dashed line is the inferred background under the Josephson peak. Inset: temperature dependence of the Josephson current normalized to its value at , where is the normal state resistance at . The current corresponds to a square of the shaded area like that shown for the curve at .
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