Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review B
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 the magnetic R ions on the icosahedron within the Tsai-type cluster by nonmagnetic Y disrupts the commensurate magnetic ordering in the approximant phase.
American Physical Society
Yamada, T.; Takakura, H.; Kong, Tai; Das, Pinaki; Jayasekara, W. T.; Kreyssig, Andreas; Beutier, G.; Canfield, Paul C.; de Boissieu, M.; and Goldman, Alan I., "Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism" (2016). Physics and Astronomy Publications. 575.