Magnetic properties of Ho(3-x)Y(x)Cu(4)Sn(4) (x=0, 1, 2)

作者：Gondek L; Arulray A; Baran S; Nenkov K; Penc B; Szytula A^*; Tomala K

来源：Journal of Physics: Condensed Matter , 2008, 20(29): 295205.

DOI：10.1088/0953-8984/20/29/295205

X-ray and neutron diffraction, isothermal magnetization, magnetic susceptibility and specific heat measurements were performed on polycrystalline samples of Ho(3-x)Y(x)Cu(4)Sn(4) for x = 0, 1,2. All samples crystallize with the orthorhombic structure of Gd(3)Cu(4)Ge(4) type. Within this crystal structure the rare earth atoms occupy two non-equivalent 2d and 4e positions. The presented x-ray data clearly indicate that introduced yttrium atoms prefer the 4e sublattice. Increase of the yttrium content causes a decrease of the Neel temperature from 7.6 K for x = 0 down to about 1.5 K for x = 2. Neutron diffraction data indicate that only Ho magnetic moments within the 2d sublattice order antiferromagnetically. The Ho moments are parallel to the b-axis. They form a collinear magnetic structure with the propagation vector k = (0, 1/ 2, 0) with [++] sign sequence.

• 出版日期2008-7-23