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. 2015 Nov 9;5:16385. doi: 10.1038/srep16385

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(a,b) In-plane electrical resistivity (ρ_ab) is plotted as a function of temperature for selective pressure. Arrows mark the structural (T_s) and antiferromagnetic phase transition (T_N) in (a,b), respectively. ρ_ab for different pressures was rigidly shifted upwards for clarity. (c) ρ_ab is magnified near the superconducting transition region, where T_c,on is defined as the onset temperature of the SC phase transition. (d,e) First temperature derivative of the resistivity is shown as a function of temperature. Arrows mark T_s and T_N in (d,e), respectively. (f) Temperature-pressure phase diagram of FeSe. SC, AFM, and PM stand for superconducting, antiferromagnetic, and paramagnetic phase, respectively. Tetra and Ortho are the acronym of tetragonal and orthorhombic crystal structure.