Zero-bias anomaly in CrO 2 junctions

Zero-bias anomaly in CrO2 junctions

– CrO2 thin films, with crystallites of several microns size, provide the opportunity for the investigation of the intergrain tunneling between a few crystals separated by a 1–2 nm thick Cr2O3 film. A pronounced zero-bias anomaly of the conductance is found at low temperatures. Combined photoemission and inverse photoemission temperature-dependent studies confirm the occurrence of Coulomb block...

Zero-bias anomaly in finite-size systems.

The small energy anomaly in the single particle density of states of disordered interacting systems is studied for the zero dimensional case. This anomaly interpolates between the non–perturbative Coulomb blockade and the perturbative limit, the latter being an extension of the Altshuler–Aronov zero bias anomaly at d = 0. Coupling of the zero dimensional system to a dissipative environment lead...

Title Anomaly of zero-bias conductance peaks in ferromagnet/d-wave superconductor junctions

Theory of the zero-bias anomaly in magnetic tunnel junctions: Inelastic tunneling via impurities

Using the closed-time path-integral approach, we nonperturbatively study inelastic tunneling of electrons via magnetic impurities in the barrier accompanied by phonon emission in a magnetic tunnel junction. The spectrum density of phonon emission is found to show a power-law infrared singularity ,v−s1−gd with g the dimensionless electron-phonon coupling. As a consequence, the tunneling conducta...

Zero Bias Conductance Peak Enhancement in Bi2Sr2CaCu2O8/Pb Tunneling Junctions

We found strong zero bias conductance peak enhancement in Bi2Sr2CaCu2O8 by tunneling in the ab-plane direction. Our results are consistent with recent studies on Andreev reflection between a d-wave superconductor and normal metal. We have also observed exotic behaviors of the conductance peak if the counter electrode is a conventional superconductor. If these characteristics are better understo...