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

被引:11
|
作者
Singh, Surjeet [1 ]
Suryanarayanan, R. [1 ]
Tackett, R. [2 ]
Lawes, G. [2 ]
Sood, A. K. [3 ]
Berthet, P. [1 ]
Revcolevschi, A. [1 ]
机构
[1] Univ Paris Sud, Lab Phys Chim Etat Solide, UMR 8182, Orsay, France
[2] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48202 USA
[3] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
关键词
D O I
10.1103/PhysRevB.77.020406
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The recent discovery of spin ice is a spectacular example of the noncoplanar spin arrangements that can arise in the pyrochlore A(2)B(2)O(7) 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 one-in, three-out spin structure as opposed to the three-in, one-out structure in dipolar spin ices, as the field exceeds a critical value.
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页数:4
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