Chemical Pressure and Physical Pressure in BaFe_2(As_{1-x}P_{x})_2

Abstract

Measurements of the superconducting transition temperature, T_c, under hydrostatic pressure via bulk AC susceptibility were carried out on several concentrations of phosphorous substitution in BaFe_2(As_{1-x}P_x)_2. The pressure dependence of unsubstituted BaFe_2As_2, phosphorous concentration dependence of BaFe_2(As_{1-x}P_x)_2, as well as the pressure dependence of BaFe_2(As_{1-x}P_x)_2 all point towards an identical maximum T_c of 31 K. This demonstrates that phosphorous substitution and physical pressure result in similar superconducting phase diagrams, and that phosphorous substitution does not induce substantial impurity scattering.

arXiv comment5 pages, 4 figures, to be published in Journal of the Physical Society of Japan

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• Thermodynamic phase diagram and phase competition in BaFe2(As1-xPx)2 studied by thermal expansion
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• Tripling of the Superconducting Critical Current Density in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ Retained After Pressure Release