Abstract
We report the structure and physical properties of a new rare-earth (RE) high-entropy boride (HEB) (Dy0.2Ho0.2Er0.2Tm0.2Lu0.2)(Rh0.85Ru0.15)4B4. The as-cast HEB consists of a highly crystallized, body-centered-tetragonal phase (I41/acd, a = 7.460 Å and c = 14.860 Å); here, all the RE elements share the same crystallographic site and are distributed uniformly on both macroscopic and microscopic scales. At high temperature, the HEB shows a paramagnetic behavior with a large effective moment peff yet it becomes a bulk superconductor upon cooling below 6.0 K. Remarkably, a peculiar cocktail effect of properties is observed: while the lattice parameters, Tc and peff of the HEB agree reasonably well with the compositional averages of the individual pseudo-ternary counterparts, the increased RE mixing entropy tends to suppress the superconductivity even without the magnetic exchange interactions, and a reentrant resistive transition is induced at magnetic fields above 0.8 T. Our results indicate that the high-entropy design of the RE sublattice is a viable way to tune the electrical and magnetic properties in RE intermetallics.
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