Abstract
Tsai-type 1/1 RE-Au-Al approximant crystal (AC) phases RE14AuxAl86-x (RE = Gd, Tb) display a large homogeneity range (50 < x < 75) across which distinct changes of magnetic properties – from spin glass to ferromagnetic (FM) to antiferromagnetic (AFM) – and intricate changes in structural properties occur. Here we analyzed selected 1/1 Ho- and Sm-Au-Al AC phases in the range 53 < x < 71 with single crystal X-ray diffraction and magnetometry. We find that the Al/Au ordering behavior and associated structural changes with x are similar in both systems, and match that observed for RE = Gd, suggesting that the structural evolution with x is rather independent from the type of RE. On the other hand, the magnetic properties, and notably the type of long-range order obtained at large x, are strongly depending on the RE. Ho14AuxAl86-x samples with x = 61 – 71 consistently displayed a ferrimagnetic behavior whereas Sm14AuxAl86-x samples with x = 67 and 71 revealed AFM behavior.
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