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J Phys Condens Matter. 2009 Jun 10;21(23):232202. doi: 10.1088/0953-8984/21/23/232202. Epub 2009 May 11.

Superconducting and normal phases of FeSe single crystals at high pressure.

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  • 1INAC/SPSMS, CEA-Grenoble, 17 rue des martyrs, F-38054 Grenoble, France.


We report on the synthesis of superconducting single crystals of FeSe and their characterization by x-ray diffraction, magnetization and resistivity. We have performed ac susceptibility measurements under high pressure in a hydrostatic liquid argon medium up to 14 GPa and we find that T(C) increases up to 33-36 K in all samples, but with slightly different pressure dependences on different samples. Above 12 GPa no traces of superconductivity are found in any sample. We have also performed a room temperature high pressure x-ray diffraction study up to 12 GPa on a powder sample, and we find that, between 8.5 and 12 GPa, the tetragonal PbO structure undergoes a structural transition to a hexagonal structure. This transition results in a volume decrease of about 16% and is accompanied by the appearance of an intermediate, probably orthorhombic, phase.

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