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

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 $i{d}_{xy}$ order parameter. We found that it can be followed down to low fields at optimum doping, but not away from it.

arXiv comment9 pages, 8 figures, accepted for publication in Phys. Rev. B

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Cited by in corpus (3)

• Local tunneling probe of (110) Y_0.95Ca_0.05Ba_2Cu_3O_7-delta thin films in a magnetic field
• Andreev Reflection without Fermi surface alignment in High T${}_c$-Topological heterostructures
• Angular momentum blockade in nanoscale high-T_c superconducting grains