Tunneling data on La1.28Sr1.72Mn2O7 crystals confirm Coulomb interaction effects through the root 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 similar to 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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