Characteristic Energy of the Coulomb Interactions and the Pileup of States

Abstract

Tunneling data on $\mathrm{L}{\mathrm{a}}_{1.28}\mathrm{S}{\mathrm{r}}_{1.72}\mathrm{M}{\mathrm{n}}_2{\mathrm{O}}_7$ crystals confirm Coulomb interaction effects through the $\sqrt{\mathrm{E}}$ dependence of the density of states. Importantly, the data and analysis at high energy, E, show a pileup of states: most of the states removed from near the Fermi level are found between ~40 and 130 meV, from which we infer the possibility of universal behavior. The agreement of our tunneling data with recent photoemission results further confirms our analysis.

arXiv comment4 pages, 4 figures, submitted to PRL

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