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

Authors
  • Okamura, H.
  • Shoji, K.
  • Miyata, M.
  • Sugawara, H.
  • Moriwaki, T.
  • Ikemoto, Y.
Type
Preprint
Publication Date
Mar 18, 2013
Submission Date
Mar 18, 2013
Identifiers
arXiv ID: 1303.4182
Source
arXiv
License
Yellow
External links

Abstract

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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