High pressure effects on the crystal structure and magnetic state of ${\mathrm{Pr}}_{0.52}{\mathrm{Sr}}_{0.48}\mathrm{Mn}{\mathrm{O}}_3$ manganite up to 31 and $4\mathrm{GPa}$ have been studied by means of the x-ray and neutron powder diffraction, respectively. At ambient pressure, ${\mathrm{Pr}}_{0.52}{\mathrm{Sr}}_{0.48}\mathrm{Mn}{\mathrm{O}}_3$ has a tetragonal crystal structure (space group $I4∕mcm$) and exhibits a ferromagnetic state below $T_C=270\mathrm{K}$. The lattice compression at ambient temperature is anisotropic at $P<6\mathrm{GPa}$ with the most compressible $a$ axis and it becomes isotropic with nearly equal compressibilities of $a$ and $c$ axes at higher pressures. At $P⩾2\mathrm{GPa}$, an $A$-type antiferromagnetic ground state $(T_N\approx 250\mathrm{K})$ is stabilized in ${\mathrm{Pr}}_{0.52}{\mathrm{Sr}}_{0.48}\mathrm{Mn}{\mathrm{O}}_3$ instead of the ferromagnetic one. Its onset is accompanied by the structural transformation from the tetragonal structure of $I4∕mcm$ symmetry to the orthorhombic structure of $Fmmm$ symmetry. The role of $e_g$ orbital polarization in the pressure-induced structural and magnetic response of ${\mathrm{Pr}}_{0.52}{\mathrm{Sr}}_{0.48}\mathrm{Mn}{\mathrm{O}}_3$ is discussed. The observed high pressure effects are compared with chemical substitution effects in ${\mathrm{Pr}}_{1-x}{\mathrm{Sr}}_x\mathrm{Mn}{\mathrm{O}}_3$ compounds with $x=0.48–0.6$.

• Received 22 March 2007

DOI:https://doi.org/10.1103/PhysRevB.76.094408