High pressure effects on the crystal and magnetic structure of La 0.7 Sr 0.3 MnO 3

The crystal and magnetic structure of manganite La 0.7 Sr 0.3 MnO 3 has been studied in the pressure range 0–7.5 GPa and the temperature range 4–300 K. The ferromagnetic state of La 0.7 Sr 0.3 MnO 3 remains stable in the whole studied pressure range. The Curie temperature increases as d T C /d P = 4.3 K GPa −1 . Unlike the manganites with orthorhombic crystal structure, the pressure-induced increase of T C in La 0.7 Sr 0.3 MnO 3 having the rhombohedral crystal structure of symmetry may be explained by modification of structural parameters only. The difference between the properties of manganites with rhombohedral and orthorhombic structures under high pressure is discussed in terms of the symmetry of MnO 6 octahedra.