Pu₂M₃Si₅（M = Co，Ni）中的磁有序
Magnetic order in Pu₂M₃Si₅ (M = Co, Ni).
作者信息
Bauer E D, Tobash P H, Mitchell J N, Kennison J A, Ronning F, Scott B L, Thompson J D
机构信息
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
出版信息
J Phys Condens Matter. 2011 Mar 9;23(9):094223. doi: 10.1088/0953-8984/23/9/094223.
The physical properties including magnetic susceptibility, specific heat, and electrical resistivity of two new plutonium compounds Pu2M3Si5 (M = Co, Ni) are reported. Pu2Ni3Si5 crystallizes in the orthorhombic U2Co3Si5 structure type, which can be considered a variant of the BaAl4 tetragonal structure, while Pu2Co3Si5 adopts the closely related monoclinic Lu2Co3Si5 type. Magnetic order is observed in both compounds, with Pu2Ni3Si5 ordering ferromagnetically at T(C) = 65 K then undergoing a transition into an antiferromagnetic state below T(N) = 35 K. Two successive magnetic transitions are also observed at T(mag1) = 38 K and T(mag2) = 5 K in Pu2Co3Si5. Specific heat measurements reveal that these two materials have a moderately enhanced Sommerfeld coefficient γ ∼ 100 mJ/mol Pu K(2) in the magnetic state with comparable RKKY and Kondo energy scales.
报道了两种新型钚化合物Pu2M3Si5（M = Co，Ni）的物理性质，包括磁化率、比热和电阻率。Pu2Ni3Si5以正交晶系U2Co3Si5结构类型结晶，该结构可视为BaAl4四方结构的变体，而Pu2Co3Si5采用密切相关的单斜晶系Lu2Co3Si5类型。在这两种化合物中均观察到磁有序现象，Pu2Ni3Si5在T(C)=65 K时呈铁磁有序排列，然后在T(N)=35 K以下转变为反铁磁状态。在Pu2Co3Si5中，还在T(mag1)=38 K和T(mag2)=5 K处观察到两个连续的磁转变。比热测量表明，这两种材料在磁状态下具有适度增强的索末菲系数γ~100 mJ/mol Pu K(2)，其RKKY和近藤能量尺度相当。
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