Coupling of frustrated ising spins to the magnetic cycloid in multiferroic TbMnO3

被引：70

作者：

Prokhnenko, O.

Feyerherm, R.

Mostovoy, M.

Aliouane, N.

Dudzik, E.

Wolter, A. U. B.

Maljuk, A.

Argyriou, D. N.

机构：

[1] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

[2] BESSY, Hahn Meitner Inst Kernforsch Berlin GmbH, D-12489 Berlin, Germany

[3] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.99.177206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on diffraction measurements on multiferroic TbMnO3 which demonstrate that the Tb- and Mn-magnetic orders are coupled below the ferroelectric transition T-FE = 28 K. For T < T-FE the magnetic propagation vectors (tau) for Tb and Mn are locked so that tau(Tb) = tau(Mn), while below T-N(Tb) = 7 K we find that tau(Tb) and tau(Mn) lock-in to rational values of 3/7b(*) and 2/7 b(*), respectively, and obey the relation 3 tau(Tb) - tau(Mn) = 1. We explain this novel matching of wave vectors within the frustrated anisotropic next- nearest- neighbor Ising model coupled to a periodic external field produced by the Mn-spin order. The tau(Tb) = tau(Mn) behavior is recovered when Tb magnetization is small, while the tau(Tb) = 3/7 regime is stabilized at low temperatures by a peculiar arrangement of domain walls in the ordered state of Ising-like Tb spins.

引用

页数：4

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