Neutron diffraction in Ho(Mn0.9Al0.1)2 under pressure up to 7.8 GPa:: Long-range magnetic order induced by pressure in a frustrated system -: art. no. 140401

In Ho(Mn0.9Al0.1)(2), applying pressure results in the occurrence of several magnetic phase transitions. The disordered phase disappears and long-range ordered phases are stabilized, as the pressure suppresses the frustrated Mn spins. A canted antiferromagnetic structure appears initially, then transforms into a ferromagnetic structure. The suppression of frustration is associated with a change in the delicate energy balance of the spin interactions, as the rare earth magnetism becomes dominant. The changes in the magnetic order are interpreted by a change in the nature of Mn magnetism, from a localized to an induced and finally to a nonmagnetic state.