Order parameter node removal in the d-wave superconductor $YB{a}_{2}C{u}_3{O}_{7-x}$ under magnetic field

Abstract

hether the node in the order parameter characteristic of a $d-wave$ superconductor can or cannot be removed by an applied magnetic field has been a subject of debate in recent years. Thermal conductivity results on the high Tc superconductor $B{i}_{2}S{r}_{2}CaC{u}_2{O}_8$ originally explained by Laughlin in terms of such a node removal were complicated by hysteresis effects, and judged inconclusive. We present new tunneling data on $YB{a}_{2}C{u}_3{O}_{7-x}$ that support the existence of the node removal effect, under specific orientations of the sample's surfaces and magnetic field. We also explain the hysteretic behavior and other previous tunneling results so far not understood satisfactorily, attributing them to a combination of node removal and Doppler shift of low energy surface bound states.

3 pages, 3 figures

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• Effect of Surface Andreev Bound States on the Bean-Livingston Barrier in d-Wave Superconductors
• 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
• Absence of broken time reversal symmetry beneath the surface of YBCO films
• Superfluid density and competing orders in d-wave superconductors
• Tunneling interstitial impurity in iron-chalcogenide based superconductors
• Local tunneling probe of (110) Y_0.95Ca_0.05Ba_2Cu_3O_7-delta thin films in a magnetic field
• Remarkable change of tunneling conductance in YBCO films in fields up to 32.4T
• Field Induced Nodal Order Parameter in the Tunneling Spectrum of YBa${}_2$Cu${}_3$O${}_{7-x}$ Superconductor
• Determination of the critical current density in the d-wave superconductor YBCO under applied magnetic fields by nodal tunneling