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Field Induced Nodal Order Parameter in the Tunneling Spectrum of YBa$_2$Cu$_3$O$_{7-x}$ Superconductor

G. Leibovitch·R. Beck·Y. Dagan·S. Hacohen·G. Deutscher
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Abstract

We report planar tunneling measurements on thin films of YBa$_2$Cu$_3$O$_{7-x}$ at various doping levels under magnetic fields. By choosing a special setup configuration, we have probed a field induced energy scale that dominates in the vicinity of a node of the d-wave superconducting order parameter. We found a high doping sensitivity for this energy scale. At Optimum doping this energy scale is in agreement with an induced $id_{xy}$ order parameter. We found that it can be followed down to low fields at optimum doping, but not away from it.

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G. Leibovitch, R. Beck, Y. Dagan, S. Hacohen, G. Deutscher. 2008-01-29. Field Induced Nodal Order Parameter in the Tunneling Spectrum of YBa$_2$Cu$_3$O$_{7-x}$ Superconductor. https://doi.org/10.1103/physrevb.77.094522

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