Experimental realization of a quantum breathing pyrochlore antiferromagnet

被引：70

作者：

Kimura, K. ^{[1
]}

Nakatsuji, S. ^{[2
,3
]}

Kimura, T. ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Div Mat Phys, Toyonaka, Osaka 5608531, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Japan Sci & Technol Agcy JST, PRESTO, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 06期

关键词：

CRYSTAL-STRUCTURE; SPIN LIQUIDS; FIELDS; ORDER; ICE;

D O I：

10.1103/PhysRevB.90.060414

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The synthesis and characterization of a Yb-based material Ba3Yb2Zn5O11 are reported. This material is identified as a model system of a pseudospin-1/2 quantum antiferromagnet on "breathing" pyrochlore lattice characterized by an alternating array of small and large Yb tetrahedra. Despite dominant antiferromagnetic interactions J similar to 7 K, a large amount of magnetic entropy (25%) remains at 0.38 K, indicating that each small Yb tetrahedron forms a unique doubly degenerate singlet state. These results are well described by the Heisenberg pseudospin-1/2 single tetrahedron model.

引用

页数：5

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