Characteristic Energy of the Coulomb Interactions and the Pileup of States

Details Characteristic Energy of the Coulomb Interactions and the Pileup of States Characteristic Energy of the Coulomb Interactions and the Pileup of States

2007-08-07

arxiv.org/abs/0708.0950v1

Phys. Rev. B 76, 193102 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevB.76.193102

Tunneling data on $\mathrm{La_{1.28}Sr_{1.72}Mn_2O_7}$ 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.

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