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- W2094186684 abstract "A structure determination using high-resolution neutron powder data has shown that the hexagonal compound TbCo6Ge6 (P6/mmm) has the YCo6Ge6-type structure. The R and the Ge1 atoms share the 1(a) (000) and the 2(e) (00z) sites while the Ge2 and Co atoms are at 2(c) (1/3, 2/3, 0) and 3(g) (1/2, 0, 1/2), respectively. The refinement has shown that the Tb/Ge distribution is 0.36 Tb and 0.14 Ge1 for the 1(a) site and 0.74 Ge1 and 0.26 Tb for the 2(e) site. This atomic distribution leads to different R–R interactions to those observed in the parent compounds TbMn6Ge6 and TbFe6Ge6. As the Co–Co interaction is very weak a possible TbCo6Ge6 ordering could be caused by the R–R interaction. However, no evidence of magnetic ordering in TbCo6Ge6 has been obtained down to 1.5 K. The coexisting tetragonal phase (I4/mmm) of TbCo2Ge2 with ThCr2Si2 structure reported earlier to order antiferromagnetically at 31 K with a uniaxial moment arrangement along c and the wave vector (001) was found to undergo a magnetic phase transition at 22 K. Above this temperature the magnetic structure changes into a longitudinal sinewave incommensurate phase with the wave vector q=(0, 0, 1−qz), or qz=0.063(1) r.l.u when referring to the primitive cell. This wave vector corresponds to a 16×c cell enlargement and its length is temperature-dependent and at T1≈22 K locks in to the (001) value. The Tb atoms related by the centering translation are coupled antiparallely over the entire ordered regime. The ordered moment value varies from 8.8(1)μB/Tb atom at 1.5 K to 7.9(1) μB/Tb at 22 K. The amplitude of the modulated structure is 9.3(2)μB at 24 K." @default.
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- W2094186684 date "1998-06-01" @default.
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- W2094186684 title "Magnetic order in the TbCo6Ge6 and TbCo2Ge2 compounds: A neutron study" @default.
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- W2094186684 doi "https://doi.org/10.1016/s0925-8388(98)00556-8" @default.
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