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A phase transition was observed in the tetragonal FeSe superconductor under high pressure at around 2.55GPa using X-ray scattering and Raman spectrum. From X-ray powder diffraction (XRD) experiments, the slope of the unit cell volume versus pressure curve change slightly at around 2.55–4GPa, and the Bragg peaks of FeSe tetragonal phase disappear when the pressure reaches 11.4GPa. We also found the...
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