Magnetic ordering and specific features of its coexistence with superconductivity in Dy0.6Y0.4Rh3.85Ru0.15B4

The temperature dependences of dynamic magnetic susceptibility of a magnetic superconductor Dy0.6Y0.4Rh3.85Ru0.15B4 in a temperature range of 2-50 K and the field dependence of magnetization up to 6 T at fixed temperatures 2, 11, 18, and 50 K were studied for the first time. It is found that at T-FM = (21 +/- 1) K there is a transition to the ferromagnetic state, and at T-c = (6.7 +/- 0.1) K a transition to superconducting state is observed, which coexists with the ferromagnetic state in a broad range of temperatures of 2-6.7 K. It is suggested that there exists a triplet mechanism of superconducting coupling in Dy0.6Y0.4Rh3.85Ru0.15B4.