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arXiv cond-mat/0201166cond-mat.str-el
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几何阻挫Yb2Ti2O7自旋动力学的一级跃迁

First Order Transition in the Spin Dynamics of Geometrically Frustrated Yb2Ti2O7

J. A. Hodges, P. Bonville, A. Forget, A. Yaouanc, P. Dalmas de Reotier, G. Andre, M. Rams, K. Krolas, C. Ritter, P. C. M. Gubbens, C. T. Kaiser, P. J. C. King, C. Baines

摘要:

本文用中子衍射、~(170)Yb穆斯堡尔谱和μ SR谱研究了Yb ~(3 + S ')= 1/2基态的烧绿石Yb_2 Ti_2 O_7的平面各向异性。在~0.24K以下,即已知比热λ跃迁的温度,不存在长程磁序。我们表明,过渡对应于一个一阶变化的Yb 3+自旋的波动率。在转变温度以上,在GHz范围内的速率遵循热激发定律,而在MHz范围内的速率在以下基本上与温度无关,指示量子波动状态。

英文摘要:

Using neutron diffraction, 170Yb Mossbauer and muSR spectroscopies, we have examined the pyrochlore Yb2Ti2O7 where the Yb3+ S'=1/2 ground state has planar anisotropy. Below ~0.24K, the temperature of the known specific heat lambda transition, there is no long range magnetic order. We show that the transition corresponds to a first order change in the fluctuation rate of the Yb3+ spins. Above the transition temperature, the rate, in the GHz range, follows a thermal excitation law, whereas below, the rate, in the MHz range, is essentially temperature independent indicative of a quantum fluctuation regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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