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arXiv 0906.2250cond-mat.mtrl-sci
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Nd1-xDyxFe3(BO3)4的晶体生长和磁性

Crystal growth and magnetic properties of Nd1-xDyxFe3(BO3)4

I. A. Gudim, E. V. Eremin, V. L. Temerov

摘要:

给出了Nd_(1-x)Dy_xFe_3(BO_3)_4在三钼酸铋基熔剂中稳定区的数据和不稳定相动力学条件的特征。描述了这些相在籽晶上和在晶体载体上的一薄层助熔剂中自发成核时单晶的成组条件。分析了x = 0,1和x = 0,25晶体的磁化强度和比热随温度和场的变化关系。结果表明,与易面NdFe_3(BO_3)_4反铁磁和易轴DyFe_3(BO_3)_4反铁磁不同,这些单晶的自发自旋翻转是固有的,并通过具有强交换作用的共同Fe子系统与稀土子系统的相互影响联系在一起。各向异性竞争对磁场H诱导的平行c_3磁相变也有重要影响。

英文摘要:

Data about stability areas of Nd1-xDyxFe3(BO3)4 trigonal phases in fluxes on the bismuth trimolibdate basis and feature of labile phase dynamics conditions is noted. Group growth conditions of these phases single crystals on seeds and at spontaneous nucleation in a thin layer of flux on crystal carrier are described. Temperature and field dependences of magnetization and a specific heat for crystals with x = 0,1 and x = 0,25 are analyzed. The conclusion, that unlike easy plane NdFe3(BO3)4 antiferromagnetic and easy axis DyFe3(BO3)4 ones, spontaneous spin-flop transitions are inherent in these single crystals is resulted and it is connected with mutual influence of rare-earth subsystems through the common Fe-subsystem with strong exchange interaction. The anisotropies competition exerts essential influence on induced by field H parallel c3 magnetic phase transitions too.

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