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arXiv 1303.4182cond-mat.str-el
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SrFe2As2光导中自旋密度波能隙的压力抑制

Pressure suppression of spin-density-wave gap in the optical conductivity of SrFe2As2

H. Okamura, K. Shoji, M. Miyata, H. Sugawara, T. Moriwaki, Y. Ikemoto

摘要:

在6GPa的外压和8K的温度下测量了SrFe_2As_2的光学反射率R(w)。从测量的R(w)导出了光学电导率s(w)。在常压下,在T_N=198 K以下的反铁磁态,由于自旋密度波(SDW)能隙的打开,s(w)出现了一个明显的特征。随着压力的增加,s(w)中的SDW间隙特征逐渐被抑制。在4GPa下,样品是超导的,SDW带隙特征s(w)比在环境压力下大大减少,但仍然可以清楚地观察到。在6GPa下,SDW间隙被完全抑制。SDW能隙和谱权的压力演化与T_N的压力演化密切相关。

英文摘要:

Optical reflectance R(w) of a pressure-induced superconductor SrFe2As2 has been measured under external pressure to 6 GPa and at temperatures to 8 K. Optical conductivity s(w) has been derived from the measured R(w). At ambient pressure, in the antiferromagnetic state below T_N=198 K, a pronounced feature develops in s(w) 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 s(w) is progressively suppressed. At 4 GPa, where the sample is superconducting, the SDW gap feature in s(w) is strongly reduced than that at ambient pressure, but is still clearly observed. At 6 GPa, the SDW gap is completely suppressed. The pressure evolutions of the SDW gap magnitude and the spectral weight closely follow the pressure evolution of T_N.

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