Antiferromagnetic order in NpRhGa5

Antiferromagnetic order in NpRhGa5
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NpRhGa5 中的反铁磁序

DOI:
10.1016/j.jallcom.2004.05.054
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发表时间:
2005
影响因子:
6.2
通讯作者:
J. Sanchez
J. Sanchez
中科院分区:
材料科学2区
文献类型:
--
作者:
E. Colineau;F. Wastin;P. Boulet;P. Javorský;J. Rebizant;J. Sanchez

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NpRhGa_5在TN= 37 K以下出现反铁磁有序。与NpCoGa 5对应物相反,NpRhGa 5在高达9 T的外加磁场中没有表现出任何相变,但在T = 32 K时经历了第二次磁性转变-归因于磁矩从c轴到基面的重新取向,这一点由磁化强度,电阻率,比热和237 Np穆斯堡尔数据证明。后者还表明存在Np 3+电荷态和有序Np矩0.96μB。NpRhGa 5和AnTGa 5(An = U,Np,Pu; T = Co,Rh)化合物的磁性比较证实了AnRhGa 5和AnCoGa 5是由共同的基础物理驱动的,并表明AnCoGa 5化合物中的磁相互作用增强,这表明PuCoGa 5与PuRhGa 5相比具有增强的超导电性可能存在联系。
NpRhGa5develops antiferromagnetic order below TN= 37K. Contrary to its NpCoGa5counterpart, NpRhGa5does not show any phase transition in applied magnetic fields up to 9T, but undergoes a second magnetic transition—attributed to a reorientation of the magnetic moments from the c-axis to the basal plane—at T∗= 32K, as evidenced by magnetization, resistivity, specific heat and237Np Mössbauer data. The latter also indicates the occurrence of a Np3+charge state and an ordered Np moment of 0.96μB. The comparison of the magnetic properties of NpRhGa5and AnTGa5(An = U, Np, Pu; T = Co, Rh) compounds confirms that AnRhGa5and AnCoGa5are driven by common underlying physics and shows that magnetic interactions are enhanced in AnCoGa5compounds, suggesting a possible link with the enhanced superconductivity in PuCoGa5compared to PuRhGa5.
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