Coexistence of magnetic phases in La(Mn0.70Ga0.30)O3 under high pressure: A neutron powder diffraction investigation

Neutron powder diffraction was used to analyse the La(Mn0.70Ga0.30)O3 compound under pressures of up to 6.1 GPa and temperatures down to 1.3 K. At ambient pressure, the magnetic ground state corresponds to a canted antiferromagnetic AxFy-type spin ordering. As the pressure increases, the Fy component is suppressed and a novel Ay-type ordering takes place coexisting with the Ax-type. The simultaneous occurrence of these spin orderings can be ascribed to a demixing of the pristine nuclear phase into a Jahn-Teller distorted phase (where the Ax-ordering takes place) and an undistorted nuclear phase which grows under pressure (where the Ay-ordering develops).