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arXiv 0906.4940cond-mat.str-el
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Nd掺杂对Ce_ xNd_{1-x} B_6固溶体磁有序性的影响

Effect of Nd substitution on the magnetic order in Ce_xNd_{1-x}B_6 solid solutions

Jean-Michel Mignot, Julien Robert, Gilles André, Masafumi Sera, Fumitoshi Iga

摘要:

用中子粉末衍射方法研究了Ce_(xNd_{1-x})B_6(x = 0.5,0.6,0.7和0.8)固溶体中磁偶极交换和反铁四极相互作用的磁有序类型。在富Ce区,两个磁相的序列,即在T N以下形成的无公度有序[k =(1/4 -δ,1/4 -δ,1/2)]和在较低温度下发生的锁定型转变,与文献报道的Ce_ xPr_{1-x} B_6的序列十分相似。对于x = 0.5,另一方面,在纯Nb 6中相同的反铁磁顺序首先发生在TN,然后共存于较低的转变温度以下的无公度分量。这些结果与以前的电阻率测量结果吻合得很好,并支持Ce和Nd的磁矩在这个系统中可以相对去耦的想法。

英文摘要:

Neutron powder diffraction measurements have been performed on Ce_xNd_{1-x}B_6 (x = 0.5, 0.6, 0.7, and 0.8) solid solutions to determine the type of magnetic order occurring in these compounds as a result of the interplay between magnetic dipole exchange and antiferroquadrupolar interactions. In the Ce-rich range, the sequence of two magnetic phases, with an incommensurate order [k = (1/4 -δ, 1/4 -δ, 1/2)] forming below T N followed by a lock-in--type transition at lower temperature, is quite similar to that reported earlier for Ce_xPr_{1-x} B_6. For x = 0.5, on the other hand, the same antiferromagnetic order as in pure NdB6 first occurs at TN, then coexists with an incommensurate component below the lower transition temperature. These results are in good agreement with previous resistivity measurements and support the idea that Ce and Nd magnetic moments in this system can be relatively decoupled.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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