High entropy alloys (HEA) are an unusual class of materials where mixtures of elements are stochastically arrayed on a simple crystalline lattice. These systems exhibit remarkable functionality, often along several distinct axes: e.g., the examples [TaNb]1-x(TiZrHf)xare high strength and damage resistant refractory metals that also exhibit superconductivity with large upper critical fields. Here we report the discovery of an
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Abstract f -electron containing HEA, [TaNb]0.31(TiUHf)0.69, which is the first to include an actinide ion. Similar to the Zr-analogue, this material crystallizes in a body-centered cubic lattice with the lattice constanta = 3.41(1) Å and exhibits phonon mediated superconductivity with a transition temperaturesT c ≈ 3.2 K and upper critical fieldsH c2 ≈ 6.4 T. These results expand this class of materials to include actinide elements, shows that superconductivity is robust in this sub-group, and opens the path towards leveraging HEAs as functional waste forms for a variety of radioisotopes. -
Chen, K.-W. ; Lai, Y. ; Chiu, Y.-C. ; Steven, S. ; Besara, T. ; Graf, D. ; Siegrist, T. ; Albrecht-Schmitt, T. E. ; Balicas, L. ; Baumbach, R. E. ( , Physical Review B)
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Lai, Y. ; Bone, S. E. ; Minasian, S. ; Ferrier, M. G. ; Lezama-Pacheco, J. ; Mocko, V. ; Ditter, A. S. ; Kozimor, S. A. ; Seidler, G. T. ; Nelson, W. L. ; et al ( , Physical Review B)