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Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism

TitleAtomic structure of the i-R-Cd quasicrystals and consequences for magnetism
Publication TypeJournal Article
Year of Publication2016
AuthorsYamada, T, Takakura, H, Kong, T, Das, P, Jayasekara, WT, Kreyssig, A, Beutier, G, Canfield, PC, de Boissieu, M, Goldman, AI
JournalPhysical Review B
Date Published08
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000381478700001
Keywordsalloys, antiferromagnetic order, approximant, ho, penrose lattice, physics, tb, zn

We report on the six-dimensional (6D) structural refinement of three members of the i-R-Cd quasicrystals (R = Gd, Dy, Tm) via synchrotron x-ray diffraction from single-grain samples, and show that this series is isostructural to the i-YbCd5.7 quasicrystal. However, our refinements suggest that the R occupancy on the Yb icosahedron sites within the Tsai-type atomic cluster is approximately 80%, with the balance taken up by Cd. Similarities between the i-R-Cd series and i-ScZn7.33, and their differences with i-YbCd5.7 and i-Ca15Cd85, indicate that there are at least two subclasses of Tsai-type icosahedral quasicrystals. We further show from x-ray resonant magnetic scattering (XRMS) measurements on a set of closely related Tb1-xYxCd6 1/1 approximants that the dilution of themagnetic R ions on the icosahedron within the Tsai-type cluster by nonmagnetic Y disrupts the commensurate magnetic ordering in the approximant phase.

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Complex States

Alternate JournalPhys. Rev. B