Abstract

X-ray and neutron diffraction, isothermal magnetization, magnetic susceptibilityand specific heat measurements were performed on polycrystalline samples ofHo3−xYxCu4Sn4 for x = 0, 1, 2. All samples crystallize with the orthorhombic structure ofGd3Cu4Ge4 type. Within this crystal structure the rare earth atoms occupy two non-equivalent 2d and 4epositions. The presented x-ray data clearly indicate that introduced yttrium atoms prefer the 4esublattice. Increase of the yttrium content causes a decrease of the Néel temperature from 7.6 K forx = 0 down toabout 1.5 K for x = 2. Neutron diffraction data indicate that only Ho magnetic moments within the2d sublattice order antiferromagnetically. The Ho moments are parallel to theb-axis. They form a collinear magnetic structure with the propagation vectork = (0,1/2,0) with[++ ] sign sequence.

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