Structural and magnetic properties of UFe6Ga6
نویسندگان
چکیده
UFe6Ga6 polycrystalline samples were prepared by arc-melting, and single crystals were grown by the Czochralski method. This compound crystallizes in the orthorhombic ScFe6Ga6-type structure (space group Immm, aZ5.0560(4), bZ8.5484(7) and cZ8.6914(7) Å), an ordered variant of the ThMn12-type structure. A ferromagnetic-type transition at TCZ530(5) K is seen in the magnetization and A.C.-susceptibility measurements, and no other magnetic anomaly is observed down to 5 K. Single crystal magnetization measurements along the three different crystallographic axes indicated a as the easy direction, with a spontaneous magnetization MSZ12.3 mB/f.u. at 5 K. The analysis of the Fe Mössbauer spectroscopy data indicated magnetic hyperfine fields, Bhf, significantly lower on 4f sites than on 8k sites, in agreement with the trend already observed on UFexAl12Kx, where the average Bhf were found to increase with the iron–iron interatomic distances. q 2005 Elsevier Ltd. All rights reserved.
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تاریخ انتشار 2005