Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-25
PRB 80, 014521 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
The effects of pressure generated in a liquid medium, clamp, pressure cell on the in-plane and c-axis resistance, temperature-dependent Hall coefficient and low temperature, magnetoresistance in CaFe2As2 are presented. The T - P phase diagram, including the observation of a complete superconducting transition in resistivity, delineated in earlier studies is found to be highly reproducible. The Hall resistivity and low temperature magnetoresistance are sensitive to different states/phases observed in CaFe2As2. Auxiliary measurements under uniaxial, c-axis, pressure are in general agreement with the liquid medium clamp cell results with some difference in critical pressure values and pressure derivatives. The data may be viewed as supporting the potential importance of non-hydrostatic components of pressure in inducing superconductivity in CaFe2As2.
Bud'ko Sergey L.
Canfield Paul. C.
Hannahs S. T.
Ni Nan
Torikachvili Milton S.
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