Suppression of superconductivity of Dy0.6Y0.4Rh3.85Ru0.15B4 in inclined magnetic fields

The electrical resistance of polycrystalline Dy0.6Y0.4Rh3.85Ru0.15B4 is measured for the first time near the superconducting transition temperature (Tc1/2 ≈ 6.66 K) in various inclined magnetic fields (φ = 0, 45, and 90°) and plots are made of R(T) and the upper critical field in dimensionless units h*(t). These dependences exhibit strong anisotropy with respect to the transport current through a sample when the orientation of the magnetic field is changed from φ = 0 to 90°. This appears to be related to texturing of the polycrystals. An analysis of the R(T) and h*(t) curves shows that the magnetic field suppresses the superconducting state more strongly at φ = 45° than at the other angles of inclination. The h*(t) dependences are analyzed in terms of the Werthamer-Helfand-Hohenberg theory and the Maki parameter α and the spin-orbital scattering parameter λSO are estimated. It is shown that for φ = 0 and 90°, α = 0 and λSO = 0 and only the orbital contribution is observed, while for φ = 45°, α = 4.2 and λ...