High pressure effects on the crystal and magnetic structure of La_0.7Sr_0.3MnO₃

Abstract

The crystal and magnetic structure of manganite La0.7Sr0.3MnO3 has been studied in the pressure range 0–7.5 GPa and the temperature range 4–300 K. The ferromagnetic state of La0.7Sr0.3MnO3 remains stable in the whole studied pressure range. The Curie temperature increases as d TC/d P = 4.3 K GPa−1. Unlike the manganites with orthorhombic crystal structure, the pressure-induced increase of TC in La0.7Sr0.3MnO3 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 MnO6 octahedra.