Optical properties of $MgCNi_3$ in the normal state

Details Optical properties of $MgCNi_3$ in the normal state Optical properties of $MgCNi_3$ in the normal state

2005-07-26

arxiv.org/abs/cond-mat/0507599v1

Phys. Rev. B 72, 092509 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.092509

We present the optical reflectance and conductivity spectra for non-oxide antiperovskite superconductor $MgCNi_{3}$ at different temperatures. The reflectance drops gradually over a large energy scale up to 33,000 cm$^{-1}$, with the presence of several wiggles. The reflectance has slight temperature dependence at low frequency but becomes temperature independent at high frequency. The optical conductivity shows a Drude response at low frequencies and four broad absorption features in the frequency range from 600 $cm^{-1}$ to 33,000 $cm^{-1}$. We illustrate that those features can be well understood from the intra- and interband transitions between different components of Ni 3d bands which are hybridized with C 2p bands. There is a good agreement between our experimental data and the first-principle band structure calculations.

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