Neutron Brillouin Scattering with Pulsed Spallation Neutron Source —Spin-Wave Excitations from Ferromagnetic Powder Samples—

Neutron Brillouin Scattering with Pulsed Spallation Neutron Source —Spin-Wave Excitations from Ferromagnetic Powder Samples—
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DOI：
10.7566/jpsj.82.043001
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发表时间：
2012-09
期刊：
Journal of the Physical Society of Japan
影响因子：
1.7
通讯作者：
S. Itoh;Y. Endoh;T. Yokoo;D. Kawana;Y. Kaneko;Y.Tokura;M. Fujita
S. Itoh;Y. Endoh;T. Yokoo;D. Kawana;Y. Kaneko;Y.Tokura;M. Fujita
中科院分区：
物理与天体物理4区
文献类型：
--
作者：
S. Itoh;Y. Endoh;T. Yokoo;D. Kawana;Y. Kaneko;Y.Tokura;M. Fujita

文献摘要

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将利用先进中子源发展起来的中子布里渊散射（NBS）方法推广到强流脉冲中子源。通过观察La0.8Sr0.2MnO3和SrRuO3粉末中的铁磁自旋波，证明了该方法的可行性。在La0.8Sr0.2MnO3中观察到了无隙自旋波激发，并从以前的单晶结果连续外推到较低的散射矢量Q。新的结果是一个定义良好的二次\（Q\）的自旋波色散曲线与大的能隙SrRuO3的依赖。
The neutron Brillouin scattering (NBS) method, which was developed using advanced neutron sources, was extended to an intense pulsed spallation neutron source. The feasibility of this method was demonstrated by observing ferromagnetic spin waves in La0.8Sr0.2MnO3 and SrRuO3 powders. Gapless spin-wave excitations were observed in La0.8Sr0.2MnO3, which were continuously extrapolated to the lower scattering vector \(Q\) from previous results using single crystals. The novel result is a well-defined quadratic \(Q\) dependence in the spin-wave dispersion curve with a large energy gap in SrRuO3.