Long-range superexchange in Cu2A2O7 (A = P, As, V) as a key element of the microscopic magnetic model

被引：45

作者：

Janson, O. ^{[1
]}

Tsirlin, A. A. ^{[1
]}

Sichelschmidt, J. ^{[1
]}

Skourski, Y. ^{[2
]}

Weickert, F. ^{[1
,2
]}

Rosner, H. ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

[2] Helmholtz Zentrum Dresden Rossendorf, Hochfeld Magnetlab Dresden, D-01314 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 09期

关键词：

ANTIFERROMAGNETISM; MONOPOLES;

D O I：

10.1103/PhysRevB.83.094435

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A microscopic magnetic model for alpha-Cu2P2O7 is evaluated in a combined theoretical and experimental study. Despite a dominant intradimer coupling J(1), sizable interdimer couplings enforce long-range magnetic ordering at T-N = 27 K. The spin model for a-Cu2P2O7 is compared to the models of the isostructural beta-Cu2V2O7 and alpha-Cu2As2O7 systems. As a surprise, coupled dimers in a-Cu2P2O7 and alternating chains in alpha-Cu2As2O7 contrast with a honeycomb lattice in beta-Cu2V2O7. We find that the qualitative difference in the coupling regime of these isostructural compounds is governed by the nature of AO(4) side groups: d elements (A = V) hybridize with nearby O atoms forming a Cu-O-A-O-Cu superexchange path, while for p elements (A = P, As) the superexchange is realized via O-O edges of the tetrahedron. Implications for a broad range of systems are discussed.

引用

页数：7

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