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Magnetism in #beta# -DyD_(2+x) and #beta# -HoD_(2+x) studied with positive muons

机译:用正介子研究#beta#-DyD_(2 + x)和#beta#-HoD_(2 + x)中的磁性

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We have examined by #mu# SR spectroscopy the four polycrystalline samples #beta# -HoD_(2.0), #beta# -HoD_(2+0.12), #beta# -DyD_(2.0), and #beta# -DyD_(2+0.135), specially to probe their magnetic short-range order (SRO) configurations. The temperature dependencies of the muon-spin relaxation rates for HoD_(2.0), HoD_(2.12), and DyD_(2.0) show similar behavior. For each compound I one can define a 'critical' temperature T_(ci) (around 5-8 K) at which the relaxation rate #lambda#_i is maximum. In the extended critical region T_(ci)-4T_(ci) the rate #lambda#_i (T) can be fitted by the trial function #lambda#_i = #alpha#_i (T-T_(ci)/T_(ci))~(vi). The critical exponents v_i are compared to theoretical predictions. DyD_(2.135) shows different features. With decreasing temperature, starting at 300 K, an increasing fraction of the initial #mu#~+ polarization is lost, due to the increasing proportion of random local fields fluctuating with rates of 10~8-10~9 s~(-1) at the #mu#~+ site. Below 10 K a spontaneous Larmor precession signal, corresponding to a field of 0.66 T, is observed. Model calculations of the local field at the #mu#~+ are performed, assuming commensurate or incommensurate magnetic structures. One infers that a commensurate SRO is likely to develop below 10 K in DyD_(2.135).
机译:我们已经通过#mu#SR光谱学检查了四个多晶样品#beta#-HoD_(2.0),#beta#-HoD_(2 + 0.12),#beta#-DyD_(2.0)和#beta#-DyD_(2 +0.135),专门用于探测其磁短程指令(SRO)配置。 HoD_(2.0),HoD_(2.12)和DyD_(2.0)的μ自旋弛豫速率的温度依赖性显示出相似的行为。对于每种化合物I,可以定义一个“临界”温度T_(ci)(约5-8 K),在该温度下,弛豫率#lambda#_i最大。在扩展的临界区域T_(ci)-4T_(ci)中,比率#lambda#_i(T)可以通过试验函数#lambda#_i =#alpha#_i(T-T_(ci)/ T_(ci ))〜(vi)。将临界指数v_i与理论预测进行比较。 DyD_(2.135)显示不同的功能。随着温度的降低,从300 K开始,初始#mu#〜+极化损失的比例增加,这是由于随机局部场的比例增加,其波动速率为10〜8-10〜9 s〜(-1)。在#mu#〜+网站上。在10 K以下,观察到自发的拉莫尔进动信号,对应于0.66 T的磁场。假设磁结构相称或不相称,则在#mu#〜+处进行局部场的模型计算。一个推断,在DyD_(2.135)中,相称的SRO可能会发展到低于10K。

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