Far-Infrared Spectroscopy of Electronic States of CuIr_2Se_4 at High Pressure(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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The spinel compound CuIr_2Se_4 at atmospheric pressure is a metal of wide temperature range, but undergoes a stabilization of the insulating phase from the metal phase at high pressures above 3 GPa. To study the change in electronic state at pressure, we performed a spectromicroscopic measurement in the far-infrared to visible region on polycrystalline CuIr_2Se_4 at high pressures up to 8GPa at room temperature. The peak structure at around 0.2eV in the optical conductivity spectra at atmospheric pressure, whose origin was assigned to the hybridized band, was found to lose its intensity at pressure accompanied by the rapid suppression of the Drude component. This change in the optical spectra at pressure indicates that the pseudo-gap state formed in the vicinity of the Fermi level is very sensitive to pressure. We discuss this behaviour in relation to the instability of the metallic state due to the increase in the degree of hybridization with pressure.
社団法人日本物理学会の論文
2005-04-15