Evidence for the band broadening across the ferromagnetic transition in Cr$_{1/3}$NbSe$_2$

Details Evidence for the band broadening across the ferromagnetic transition in Cr$_{1/3}$NbSe$_2$ Evidence for the band broadening across the ferromagnetic transition in Cr$_{1/3}$NbSe$_2$

2008-08-05

arxiv.org/abs/0808.0678v1

Phys. Rev. B 78, 085120 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.085120

The electronic structure of Cr$_{1/3}$NbSe$_2$ is studied via optical spectroscopy. We observe two low-energy interband transitions in the paramagnetic phase, which split into four peaks as the compound enters the ferromagnetic state. The band structure calculation indicates the four peaks are interband transitions to the spin up Cr e$_g$ states. We show that the peak splitting below the Curie temperature is \emph{not} due to the exchange splitting of spin up and down bands, but directly reflects a band broadening effect in Cr-derived states upon the spontaneous ferromagnetic ordering.

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