Abstract
The temperature and hydrostatic pressure dependences of anomalies observed in the ultrasonic wave velocity have been used to determine (i) the boundary corresponding to the paramagnetic (P) to commensurate transition and (ii) the first-order phase boundary between the commensurate (C) and incommensurate (I) spin-density wave (SDW) phases on the pressure-temperature phase diagram for monocrystalline Cr-0.3 at.% Ru alloy. The paramagnetic-commensurate phase boundary is linear with a negative gradient d T PC /d P= -358±4 K/ GPa. Both T CI and T IC increase approximately linearly with pressure, the mean values of dT CI / dP and dT IC / dP being 333±3 K/GPa and 277±5 K/GPa respectively. The position of the triple point is estimated as (315±5 K, 0.22±0.02 GPa). In the commensurate SDW state the alloy shows the extraordinary property that when pressure is applied it becomes easier to squeeze.
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