Impurity states and interlayer tunneling in high temperature superconductors

Details Impurity states and interlayer tunneling in high temperature superconductors Impurity states and interlayer tunneling in high temperature superconductors

2000-12-23

arxiv.org/abs/cond-mat/0012446v2

Phys. Rev. Lett. 88, 097003 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 4 eps figures. Version published in PRL

Scientific paper

10.1103/PhysRevLett.88.097003

We argue that the Scanning Tunneling Microscope (STM) images of resonant states generated by doping Zn or Ni impurities into Cu-O planes of BSCCO are the result of quantum interference of the impurity signal coming from several distinct paths. The impurity image seen on the surface is greatly affected by interlayer tunneling matrix elements. We find that the optimal tunneling path between the STM tip and the metal (Cu, Zn, or Ni) $d_{x^2 - y^2}$ orbitals in the Cu-O plane involves intermediate excited states. This tunneling path leads to the four-fold nonlocal filter of the impurity state in Cu-O plane that explains the experimental impurity spectra. Applications of the tunneling filter to the Cu vacancy defects and ``direct'' tunneling into Cu-O planes are also discussed.

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