Pressure Suppression of Spin-Density-Wave Gap in the Optical Conductivity of SrFe

概要

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Optical reflectance R(\omega) of a pressure-induced superconductor SrFe<inf>2</inf>As<inf>2</inf>has been measured under external pressure to 6 GPa and at temperatures to 8 K. Optical conductivity \sigma(\omega) has been derived from the measured R(\omega). At ambient pressure, in the antiferromagnetic state below T_{\text{N}}=198 K, a pronounced feature develops in \sigma(\omega) due to the opening of a spin density wave (SDW) gap, as already reported in the literature. With increasing pressure, the SDW gap feature in \sigma(\omega) is progressively suppressed. At 4 GPa, where the sample is superconducting, the SDW gap feature in \sigma(\omega) is strongly reduced than that at ambient pressure, but is still clearly observed. At 6 GPa, the SDW gap is completely suppressed. The evolution of SDW gap feature with pressure is qualitatively similar to that with chemical doping previously reported.
2013-07-15