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arXiv 0706.4145cond-mat.str-elcond-mat.mtrl-sci
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几何阻挫金属铁磁体Sm2Mo2O7中的有序自旋冰态

Ordered spin-ice state in the geometrically frustrated metallic-ferromagnet Sm2Mo2O7

Surjeet Singh, R. Suryanarayanan, R. Tackett, G. Lawes, A. K. Sood, P. Berthet, A. Revcolevschi

摘要:

最近发现的自旋冰是一个壮观的例子,非共面自旋安排,可以出现在烧绿石A2 B2 O 7结构。我们对金属铁磁烧绿石Sm 2 Mo 2 O 7进行了磁性和热力学研究。我们的研究,进行了定向晶体,表明Sm自旋有一个有序的自旋冰基态低于约T* = 15 K。有序自旋冰态的温度和场演化受Sm和Mo自旋之间的反铁磁耦合的支配。我们建议,作为一个强大的功能,这种耦合的结果,四面体与外部场对齐,采用“1-在,3-出”自旋结构,而不是“3-在,1-出”在偶极自旋冰,因为字段超过一个临界值。

英文摘要:

The recent discovery of Spin-ice is a spectacular example of non-coplanar spin arrangements that can arise in the pyrochlore A2B2O7 structure. We present magnetic and thermodynamic studies on the metallic-ferromagnet pyrochlore Sm2Mo2O7. Our studies, carried out on oriented crystals, suggest that the Sm spins have an ordered spin-ice ground state below about T* = 15 K. The temperature- and field-evolution of the ordered spin-ice state are governed by an antiferromagnetic coupling between the Sm and Mo spins. We propose that as a consequence of a robust feature of this coupling, the tetrahedra aligned with the external field adopt a "1-in, 3-out" spin structure as opposed to "3-in, 1-out" in dipolar spin ices, as the field exceeds a critical value.

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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