Competing exchange interactions in Co-doped ZnO: Departure from the superexchange picture

被引：14

作者：

D'Ambrosio, S. ^{[1
]}

Pashchenko, V. ^{[2
]}

Mignot, J. -M. ^{[3
]}

Ignatchik, O. ^{[4
]}

Kuzian, R. O. ^{[5
]}

Savoyant, A. ^{[1
]}

Golacki, Z. ^{[6
]}

Grasza, K. ^{[6
]}

Stepanov, A. ^{[1
]}

机构：

[1] Aix Marseille Univ, FST, CNRS, IM2NP,UMR 6242, F-13397 Marseille 20, France

[2] Natl Acad Sci Ukraine, BI Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine

[3] CEA, CEA Saclay, Lab Leon Brillouin, CNRS, F-91191 Gif Sur Yvette, France

[4] Helmholtz Zentrum Dresden Rossendorf, Hochfeld Magnetlabor Dresden, D-01314 Dresden, Germany

[5] Inst Mat Sci Agh, UA-03180 Kiev, Ukraine

[6] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 03期

关键词：

DILUTED MAGNETIC SEMICONDUCTORS; FERROMAGNETISM; ANISOTROPY; CLUSTERS; OXIDES; IONS;

D O I：

10.1103/PhysRevB.86.035202

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the results of a comprehensive study of the exchange interactions in Co-doped ZnO using inelastic neutron scattering, electron paramagnetic resonance, and magnetic property measurements. In particular, we observe an unprecedentedly strong spatial anisotropy of the two nearest-neighbor exchanges, J((1)) = -25.6 +/- 0.3 K and J((2)) = -8.5 +/- 0.4 K, along with the distant-neighbor J values of ferromagnetic sign. We argue that the superexchange mechanism alone cannot account for the obtained data and we suggest that an additional mechanism leading to a strong ferromagnetic spin coupling is responsible for these findings. We also discuss the origin of this ferromagnetic mechanism.

引用

页数：4

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