W J Duncan et al 2010 J. Phys.: Condens. Matter 22 052201 doi:10.1088/0953-8984/22/5/052201
W J Duncan1, O P Welzel2, C Harrison1, X F Wang3, X H Chen3, F M Grosche2 and P G Niklowitz1
Show affiliationsWe investigate the evolution of the electrical resistivity of BaFe2As2 single crystals with pressure. The samples used were from the same batch, grown using a self-flux method, and showed properties that were highly reproducible. Samples were pressurized 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 the spin density wave order and favours the appearance of superconductivity, which is similar to what is seen in SrFe2As2.
62.50.-p High-pressure effects in solids and liquids
74.70.Dd Ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides, etc.)
74.25.Dw Superconductivity phase diagrams
74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
Issue 5 (10 February 2010)
Received 22 October 2009
Published 5 January 2010
W J Duncan et al 2010 J. Phys.: Condens. Matter 22 052201
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