Dynamic properties of a diluted pyrochlore cooperative paramagnet (Tb(p)Y(1-p))2Ti2O7.
Dynamic properties of a diluted pyrochlore cooperative paramagnet (Tb(p)Y(1-p))2Ti2O7.
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DOI：
10.1103/physrevlett.92.107204
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发表时间：
2004-03
影响因子：
8.6
通讯作者：
Amit Keren;J. Gardner;Georg Ehlers;A. Fukaya;Eva Segal;Yohei Uemura
中科院分区：
文献类型：
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作者：
Amit Keren;J. Gardner;Georg Ehlers;A. Fukaya;Eva Segal;Yohei Uemura
利用μ子自旋弛豫和中子自旋回波研究了几何阻挫烧绿石（Tb（p）Y（1-p））_2Ti_2O_7的自旋动力学随磁覆盖率p的变化.我们的主要发现是，顺磁波动占主导地位的T->0的所有值的p，他们是敏感的稀释，表明合作的自旋运动。然而，渗流阈值pc不是波动的临界点。我们还发现，低温谱密度有1/f的行为，稀释减慢自旋起伏。
Investigations of the spin dynamics of the geometrically frustrated pyrochlore (Tb(p)Y(1-p))2Ti2O7, using muon spin relaxation and neutron spin echo, as a function of magnetic coverage p, have been carried out. Our major finding is that paramagnetic fluctuations prevail as T-->0 for all values of p, and that they are sensitive to dilution, indicating a cooperative spin motion. However, the percolation threshold pc is not a critical point for the fluctuations. We also find that the low temperature spectral density has a 1/f behavior, and that dilution slows down the spin fluctuations.