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.

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

References in corpus (3)

• Shadow on the wall cast by an Abrikosov vortex
• Order parameter node removal in the d-wave superconductor $YB{a}_{2}C{u}_3{O}_{7-x}$ under magnetic field
• Transition from a mixed to a pure d-wave symmetry in superconducting optimally doped YBa${}_2$Cu${}_3$O${}_{7-x}$ thin films under applied fields