Anomalies of magnetic properties and magnetovolume effect in Cd_(1-x)Mn_xGeAs_2 at hydrostatic pressure

摘要

We present the experimental results of the effect hydrostatic pressure up to P≤7GPa applied at the room temperatures in diluted magnetic semiconductor Cd_(1-x)Mn_xGeAs_2 (x = 0.06- 0.3). We have found the pressure areas at which anomalies in magnetic properties were observed. Induced by hydrostatic pressure at P >1.5 GPa magnetic phase transitions, interpreted as metamagnetic transition, were observed. The transitions from magnetic-ordered into magnetic disordered phases in region P > 4.1 GPa on the pressure dependences of relative volume compressibility were detected. We estimated the values of bulk modulus and volume magnetostriction. It is shown that high pressures significantly decrease the Curie temperature with values dT_c/dP ≈ ((-14.0)÷(- 6.8)) K/GPa.