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 severa l magnetic phase transitions. The disordered phase disappears and long-rang e ordered phases are stabilized, as the pressure suppresses the frustrated Mn spins. A canted antiferromagnetic structure appears initially, then tran sforms into a ferromagnetic structure. The suppression of frustration is as sociated with a change in the delicate energy balance of the spin interacti ons, as the rare earth magnetism becomes dominant. The changes in the magne tic order are interpreted by a change in the nature of Mn magnetism, from a localized to an induced and finally to a nonmagnetic state.