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VOLUME 60 (1994) | ISSUE 3 | PAGE 182
Tunneling spectroscopy of highly correlated systems
In the course of tunneling between two highly correlated systems, Coulomb repulsion causes a substantial renormalization of the tunneling matrix element. At half-filling (in the insulating phase), this renormalization leads to a cutoff of the tunneling current, regardless of the sign of the voltage. For an arbitrary filling, a tunneling conductivity exists in the insulating phase only to the extent that the filling differs from half-filling. Experimental implications for STM images are discussed in the particular case of EuX systems with / shells. © 1994 American institute of Physics.