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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2009

Superconducting and normal phases of FeSe single crystals at high pressure

Résumé

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 TC 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.

Dates et versions

hal-03869180 , version 1 (24-11-2022)

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Citer

Daniel Braithwaite, B Salce, G Lapertot, Frederic Bourdarot, C Marin, et al.. Superconducting and normal phases of FeSe single crystals at high pressure. Journal of Physics: Condensed Matter, 2009, 21 (23), pp.232202. ⟨10.1088/0953-8984/21/23/232202⟩. ⟨hal-03869180⟩
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