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

Details 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 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

2006-12-06

arxiv.org/abs/cond-mat/0612140v2

Phys. Rev. Lett. 98, 137002 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.137002

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 $CuO_2$ 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.

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