Pressure dependence of the superconducting and magnetic transition temperatures in Sr2VO3FeAs

We report muon spin rotation $(\ensuremath{\mu}\mathrm{S}\mathrm{R})$ and magnetization measurements on superconducting ${\mathrm{Sr}}_{2}{\mathrm{VO}}_{3}\mathrm{Fe}\mathrm{As}$ under pressure. At ambient pressure, ${\mathrm{Sr}}_{2}{\mathrm{VO}}_{3}\mathrm{Fe}\mathrm{As}$ undergoes an antiferromagnetic transition of the V moments at ${T}_{N}$ and becomes superconducting at ${T}_{c}l{T}_{N}$. As a function of pressure, ${T}_{N}$ initially decreases while ${T}_{c}$ increases. Surprisingly, once ${T}_{N}\ensuremath{\approx}{T}_{c}$ at 0.6 GPa, ${T}_{N}$ reverses its trend and increases together with ${T}_{c}$, which might indicate a cooperative coupling of the superconducting and the magnetic order.