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

Abstract

We have probed the Landau levels of nodal quasi-particles by tunneling along a nodal direction of (110) oriented YBa${}_2$Cu${}_3$O${}_{7-x}$ thin films with a magnetic field applied perpendicular to the $Cu{O}_2$ planes, and parallel to the film's surface. In optimally doped films and at low temperature, finite energy nodal states are clearly observed in films thinner than the London penetration depth. Above a well defined temperature the order parameter reverts to a pure \emph{d}-wave symmetry.

arXiv comment4 pages, 4 figures

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