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Superconductivity under pressure in FeSe ($T_{\rm c}$$\sim$7.5 K) has beeninvestigated using single-crystal specimens through the measurements of DCmagnetization and electrical resistivity. A characteristic three-step increasein $T_{\rm c}$ has been found under hydrostatic pressure up to $\sim$34 K above7 GPa. The structural transition from a tetragonal phase to an orthorhombicphase ($T_{\rm s}$$\sim$87 K) is found to disappear at $P$$\sim$2.3 GPa, abovewhich $T_{\rm c}$ increases rapidly, suggesting that the superconductivity isenhanced by the tetragonal environment. Under non-hydrostatic pressure, theincrease in $T_{\rm c}$ is suppressed and the superconductive volume fractionis considerably reduced above 2 GPa, probably owing to the breaking of thetetragonal lattice symmetry by the uniaxial stress. The intimate correlationbetween the enhanced (suppressed) superconductivity and the tetragonality(orthorhombicity) in the phase diagram is a common feature of FeSe and otheriron-pnictide superconductors.

Enhanced Superconductivity on the Tetragonal Lattice in FeSe under Hydrostatic Pressure