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首页> 外文期刊>Physica, B. Condensed Matter >Effect of annealing on glassy dynamics and non-Fermi liquid behavior in UCu4Pd
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Effect of annealing on glassy dynamics and non-Fermi liquid behavior in UCu4Pd

机译：退火对UCu4Pd中玻璃态动力学和非费米液体行为的影响

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Longitudinal-field muon spin relaxation (LF-mu SR) experiments have been performed in unannealed and annealed samples of the heavy-fermion compound UCu4Pd to study the effect of disorder on non-Fermi liquid behavior in this material. The muon spin relaxation functions G(t, H) obey the time-field scaling relation G(t, H) = G(t/H-7) previously observed in this compound. The observed scaling exponent y = 0.3 +/- 0. 1, independent of annealing. Fits of the stretched-exponential relaxation function G(t) = exp[-(At)(K)] to the data yielded stretching exponentials K < 1 for all samples. Annealed samples exhibited a reduction of the relaxation rate at low temperatures, indicating that annealing shifts fluctuation noise power to higher frequencies. There was no tendency of the inhomogeneous spread in rates to decrease with annealing, which modifies but does not eliminate the glassy spin dynamics reported previously in this compound. The correlation with residual resistivity previously observed for a number of NFL heavy-electron materials is also found in the present work. (c) 2005 Elsevier B.V. All rights reserved.
机译：纵向场μ自旋弛豫（LF-mu SR）实验已在重金属化合物UCu4Pd的未退火和退火样品中进行，以研究无序状态对该材料中非费米液体行为的影响。介子自旋弛豫函数G（t，H）遵循先前在该化合物中观察到的时域比例关系G（t，H）= G（t / H-7）。观察到的缩放指数y = 0.3 +/- 0. 1，与退火无关。拉伸指数松弛函数G（t）= exp [-（At）（K）]对数据的拟合得出所有样本的拉伸指数K <1。退火样品在低温下的弛豫率降低，这表明退火将波动噪声功率转移到更高的频率。不存在速率不均匀分布随退火降低的趋势，该趋势改变了但并未消除该化合物先前报道的玻璃状自旋动力学。在当前的工作中，还发现了与以前观察到的许多NFL重电子材料的残余电阻率的相关性。 （c）2005 Elsevier B.V.保留所有权利。

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