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arXiv 0811.3369cond-mat.str-el
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场致多铁性GdFe3(BO3)4的磁结构

Magnetic structure of the field-induced multiferroic GdFe3(BO3)4

Haiding Mo, Christie S. Nelson, Leonard N. Bezmaternykh, V. T. Temerov

摘要:

我们报告了磁场诱导的多铁性GdFe 3(BO 3)4的磁x射线散射研究。Gd LII、III边的共振X射线磁散射表明,Gd磁矩在TN ~ 37 K处是有序的。在T_N以下,磁结构为无公度,随着温度的降低,无公度单调下降,直到T ~ 10 K时,观察到向公度磁相的转变。Gd和Fe磁矩在TSR ~ 9 K时发生自旋重取向转变,低温时磁矩沿晶体学c轴取向。沿a轴施加磁场,我们的测量表明,场致极化相具有相称的磁结构,Gd磁矩旋转约45度朝向基面,这是类似于在9和10 K之间的零场观察到的Gd子系统的磁结构,和Fe子系统具有铁磁成分的基面。

英文摘要:

We report a magnetic x-ray scattering study of the field-induced multiferroic GdFe3(BO3)4. Resonant x-ray magnetic scattering at the Gd LII,III edges indicates that the Gd moments order at TN ~ 37 K. The magnetic structure is incommensurate below TN, with the incommensurability decreasing monotonically with decreasing temperature until a transition to a commensurate magnetic phase is observed at T ~ 10 K. Both the Gd and Fe moments undergo a spin reorientation transition at TSR ~ 9 K such that the moments are oriented along the crystallographic c axis at low temperatures. With magnetic field applied along the a axis, our measurements suggest that the field-induced polarization phase has a commensurate magnetic structure with Gd moments rotated ~45 degrees toward the basal plane, which is similar to the magnetic structure of the Gd subsystem observed in zero field between 9 and 10 K, and the Fe subsystem has a ferromagnetic component in the basal plane.

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