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• W2755978628 abstract "Abstract RE (Co 0.667 Ga 0.333 ) 2 ( RE = Ho, Er) were characterized by neutron powder diffraction (NPD). Rietveld refinement of the NPD data at 280 K confirms the hexagonal MgZn 2 -type structure ( P 6 3 /mmc ), in accordance with the previous XRD results. Co/Ga occupancies on the 2 a and 6 h sites were refined to be 0.46/0.54(2) and 0.74/0.26(2), respectively, indicating a preference of Ga for the 2 a site and of Co for the 6 h site. Both materials are ferromagnetic, k = (000), with measureable moments only on the RE sites. The magnetic (Shubnikov) space group is P 6 3 / mm′c′ for the Er phase. Co moments refined to values of 0.1–0.3 μ B and are effectively zero within 3σ. The Er moment, 6.07(8) μ B at 3.5 K is parallel to the c axis and this orientation persists up to T C = 18.5 K, while the Ho moment has components along both the a and c axes with a total moment of 6.3(1) μ B at 3.5 K. Both moments are much reduced from the free ion values, 9 μ B (Er) and 10 μ B (Ho), which is attributed to crystal field effects. In addition, the Ho moment angle with the c axis is strongly temperature dependent, being roughly constant, ~ 24(6)° from T = 29 K to ~25 K, then increasing with decreasing temperature to 44(1)° at 3.5 K. Magnetic small angle neutron scattering (MSANS) was observed over a Q -range from 0.14 A −1 to 0.50 A −1 in both samples. The integrated MSANS of the Er phase peaks near T C , then decreases monotonically with decreasing temperature, behavior typical for a simple ferromagnet. On the other hand, the integrated MSANS for the Ho phase exhibits a weak peak around T C = 31 K, followed by a plateau to 25 K and a strong increase with decreasing temperatures, which tracks the evolution of the Ho moment angle with the c axis." @default.
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• W2755978628 date "2018-01-01" @default.
• W2755978628 modified "2023-09-23" @default.
• W2755978628 title "A neutron diffraction study of the hexagonal Laves phases, Ho(Co0.667Ga0.333)2 and Er(Co0.667Ga0.333)2: Co/Ga site preferences and magnetic structure" @default.
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• W2755978628 doi "https://doi.org/10.1016/j.jssc.2017.09.019" @default.
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