MAGNETIC PHASE-DIAGRAM OF THE HORH2-XRUXSI2 SOLID-SOLUTION

The magnetic phase diagram of the solid solution HoRh2-xRuxSi2 (ThCr2S i2-type crystal structure) has been established based on neutron diffr action data collected for seven intermediate compositions and suppleme nted by magnetometric data. Collinear antiferromagnetic structures des cribed by the wave vectors [0,0,1], [1/2, 1/2, 1/2] and [1/2, 1/2, 0] develop successively as the Ru concentration denoted by the index x ri ses from 0 to 0.75, followed by antiferromagnetic sine modulated struc tures with wave vectors k = [k(x), k(x), k(z)], k = [k(x), k(x), 0] an d k = [k(x), 0, 0] observed in the concentration range 0.5 < x < 2.