Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-02-27
Phys. Rev. B 75, 064411 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 7 figures
Scientific paper
We study the low energy properties of the one-orbital quantum double-exchange model by using the slave fermion formulation. We construct a mean-field theory which gives a simple explanation for the magnetic and thermodynamic properties of the ferromagnetic metallic phase in manganites at low energy. The resulting electron spectral function and tunneling density of states show an incoherent asymmetric peak with weak temperature dependence, in addition to a quasiparticle peak. We also show that the gauge fluctuations in the ferromagnetic metallic phase are completely screened due to the Anderson-Higgs mechanism. Therefore, the mean-field state is robust against gauge fluctuations and exhibits spin-charge separation at low energy.
Lee Yu-Li
Lee Yu-Wen
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