THE PHASE DIAGRAM OF Rb2Mn0.7Mg0.3F4 IN A MAGNETIC FIELD

R. Cowley , R. Birgeneau , T. Thurston , G. Shirane

The phase diagram of the quasi-two-dimensional disordered antiferromagnet, Rb2Mn0.7Mg0.3F4 in a uniform magnetic field along the unique c-axis has been measured using neutron scattering techniques. There are three distinct phases ; at high temperatures the material is paramagnetic, and on cooling in fields above 1.7 T, it undergoes a transition to a spin-flopped phase with long range order perpendicular to the c-axis. The transition temperature decreases with decreasing magnetic field and is below 2 K at 1.75 T. At lower fields there is a phase in which different domain sizes are metastable and the metastability boundary decreases in temperature with increasing field and appears to meet the phase boundary for the spin-flopped phase at T = 0.

Domaines: Articles anciens

R. Cowley, R. Birgeneau, T. Thurston, G. Shirane. THE PHASE DIAGRAM OF Rb2Mn0.7Mg0.3F4 IN A MAGNETIC FIELD. Journal de Physique Colloques, 1988, 49 (C8), pp.C8-1221-C8-1222. ⟨10.1051/jphyscol:19888553⟩. ⟨jpa-00228765⟩