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We report the pressure dependences of the superconducting transitiontemperature (T_c) in several perovskite-type Fe-based superconductors throughthe resistivity measurements up to ~4 GPa. In Ca_4(Mg,Ti)_3Fe_2As_2O_y with thehighest T_c of 47 K in the present study, the T_c keeps almost constant up to~1 GPa, and starts to decrease above it. From the comparison among severalsystems, we obtained a tendency that low T_c with the longer a-axis length atambient pressure increases under pressure, but high T_c with the shorter a-axislength at ambient pressure hardly increases. We also report the ^75As-NMRresults on Sr_2VFeAsO_3. NMR spectrum suggests that the magnetic orderingoccurs at low temperatures accompanied by some inhomogeneity. In thesuperconducting state, we confirmed the anomaly by the occurrence ofsuperconductivity in the nuclear spin lattice relaxation rate 1/T_1, but thespin fluctuations unrelated with the superconductivity are dominant. It isconjectured that the localized V-3d moments are magnetically ordered and theirelectrons do not contribute largely to the Fermi surface and thesuperconductivity in Sr_2VFeAsO_3.

Pressure Dependence of Superconducting Transition Temperature on Perovskite-Type Fe-Based Superconductors and NMR Study of Sr2VFeAsO3