Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-05-14
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures. To appear in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.95.016404
We investigate the origin of charge density wave (CDW) formation in insulators by studying BaIrO3 using high resolution (1.4 meV) photoemission spectroscopy. The spectra reveal the existence of localized density of states at the Fermi level in the vicinity of room temperature. These localized states are found to vanish as the temperature is lowered thereby, opening a soft gap at the Fermi level, as a consequence of CDW transition. In addition, the energy dependence of the spectral density of states reveals the importance of magnetic interactions, rather than well-known Coulomb repulsion effect, in determining the electronic structure thereby implying a close relationship between ferromagnetism and CDW observed in this compound. Also, Ba core level spectra surprisingly exhibit an unusual behavior prior to CDW transition.
Maiti Kalobaran
Medicherla V. R. R.
Rayaprol Sudhindra
Sampathkumaran E. V.
Singh Ravi Shankar
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