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High-resolution thermal-expansion and specific-heat measurements wereperformed on single crystalline BaFe2(As1-xPx)2 (0 < x < 0.33, x = 1). Theobservation of clear anomalies allows to establish the thermodynamic phasediagram which features a small coexistence region of SDW and superconductivitywith a steep rise of Tc on the underdoped side. Samples that undergo thetetragonal-orthorhombic structural transition are detwinned in situ, and theresponse of the sample length to the magneto-structural and superconductingtransitions is studied for all three crystallographic directions. It is shownthat a reduction of the magnetic order by superconductivity is reflected in alllattice parameters. On the overdoped side, superconductivity affects thelattice parameters in much the same way as the SDW on the underdoped side,suggesting an intimate relation between the two types of order. Moreover, theuniaxial pressure derivatives of Tc are calculated using the Ehrenfest relationand are found to be large and anisotropic. A correspondence betweensubstitution and uniaxial pressure is established, i.e., uniaxial pressurealong the b-axis (c-axis) corresponds to a decrease (increase) of the Pcontent. By studying the electronic contribution to the thermal expansion wefind evidence for a maximum of the electronic density of states at optimaldoping.

Thermodynamic phase diagram and phase competition in BaFe2(As1-xPx)2 studied by thermal expansion