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arXiv 1002.1336cond-mat.str-el
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CaFe4As3中的无公度自旋密度波和磁锁定跃迁

Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3

P. Manuel, L. C. Chapon, I. S. Todorov, D. Y. Chung, J. -P. Castellan, S. Rosenkranz, R. Osborn, P. Toledano, M. G. Kanatzidis

摘要:

用中子粉末衍射研究了新发现的铁砷化合物\CaFeAs的磁结构。在85 K以下检测到长程磁序,具有由传播矢量k=(0,$δ$,0),$δ\sim$ 0.39描述的无公度调制。低于$\sim$ 25 K,我们的测量检测到一阶相变,其中$δ$锁定到相称值3/8。的磁结构的模型,提出了两个温度制度的基础上,Rietveld细化的粉末数据和对称性的考虑。这些结构对应于磁矩沿\textit{b}轴方向的纵向自旋密度波。朗道分析捕捉到的两个磁性转变,特别是在锁定过渡电阻率下降观察到的热力学量的变化。

英文摘要:

The magnetic structure for the newly discovered iron-arsenide compound \CaFeAs has been studied by neutron powder diffraction. Long-range magnetic order is detected below 85K, with an incommensurate modulation described by the propagation vector k=(0,$δ$,0), $δ\sim$ 0.39. Below $\sim$ 25K, our measurements detect a first-order phase transition where $δ$ locks into the commensurate value 3/8. A model of the magnetic structure is proposed for both temperature regimes, based on Rietveld refinements of the powder data and symmetry considerations. The structures correspond to longitudinal spin-density-waves with magnetic moments directed along the \textit{b}-axis. A Landau analysis captures the change in thermodynamic quantities observed at the two magnetic transitions, in particular the drop in resistivity at the lock-in transition.

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