Crystal structure and electronic properties of new uranium intermetallic compound UGa_1.85Zr_0.15

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• 作者：L. Havela ; A.V. Andreev ; A.P. Gonç ; alves ; J. Š ; ebek ; V. Sechovský ; Y.F. Popov
• 关键词：Uranium compounds ; Ferromagnetism ; Metamagnetism ; Magnetostriction
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：28 July 2008
• 卷：460
• 期：1-2
• 页码：83-89
• 文件大小：680 K

摘要

The intermetallic compound UGa_1.85Zr_0.15 does not crystallize in the AlB₂ structure shared by UGa₂ and UZr₂. Instead, it forms in the same orthorhombic structure as U₃Ga₅ (Pu₃Pd₅ type), but the somewhat smaller lattice parameters reduce the unit cell volume by 2.1%with respect to U₃Ga₅. Basic magnetic properties, namely the ferromagnetic ground state below T_C = 23 K, are similar to U₃Ga₅. A more detail study of magnetic properties reveals interesting metamagnetic behavior with a critical field of 2–3 T, which increases with increasing temperature. The high γ-value of 110 mJ molp>−1p> Kp>−2p> points to a narrow 5f band at Fermi level.