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An experimental determination of electronic phase diagrams of high-transitiontemperature (high-$T_c$) superconductors forms the basis for a microscopicunderstanding of unconventional superconductivity. For most high-$T_c$superconductors, the electronic phase diagrams are established through partialchemical substitution, which also induces lattice disorder. Here we show thatsymmetry-specific uniaxial strain can be used to study electronic phases iniron-based superconductors, composed of two-dimensional nearly square ironlattice planed separated by other elements. By applying tunable uniaxial strainalong different high symmetry directions and carrying out transportmeasurements, we establish strain-tuning dependent electronic nematicity,antiferromagnetic (AF) order, and superconductivity ofBaFe$_2$(As$_{1-x}$P$_{x}$)$_2$ superconductor. We find that uniaxial strainalong the nearest Fe-Fe direction can dramatically tune the AF order andsuperconductivity, producing an electronic phase diagram clearly different fromthe chemical substitution-induced one. Our results thus establish strain tuningas a way to study the intertwined orders in correlated electron materialswithout using chemical substitution.

Uniaxial-Strain Tuning of the Intertwined Orders in BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$