High pressure study of BaFe2As2 - role of hydrostaticity and uniaxial stress

Details High pressure study of BaFe2As2 - role of hydrostaticity and uniaxial stress High pressure study of BaFe2As2 - role of hydrostaticity and uniaxial stress

2009-10-22

arxiv.org/abs/0910.4267v1

J. Phys.: Condens. Matter 22 (2010) 052201 (IoP Select)

Physics

Condensed Matter

Superconductivity

11 pages

Scientific paper

We investigate the evolution of the electrical resistivity of BaFe2As2 single crystals with pressure. The samples used were from the same batch grown from self flux and showed properties that were highly reproducible. Samples were pressurised using three different pressure media: pentane-isopentane (in a piston cylinder cell), Daphne oil (in an alumina anvil cell) and steatite (in a Bridgman cell). Each pressure medium has its own intrinsic level of hydrostaticity, which dramatically affects the phase diagram. An increasing uniaxial pressure component in this system quickly reduces spin density wave order and favours the appearance of superconductivity, similar to what is seen in SrFe2As2.

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