Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 23, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/23/232202
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Funding
- Agence Nationale de la Recherche [ANR-06-BLAN-0220]
- Agence Nationale de la Recherche (ANR) [ANR-06-BLAN-0220] Funding Source: Agence Nationale de la Recherche (ANR)
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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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