Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada, L8S 4M1.
Phys Rev Lett. 2010 Sep 3;105(10):107203. doi: 10.1103/PhysRevLett.105.107203.
LiHo(x)Y(1-x)F4 is an insulator where the magnetic Ho3+ ions have an Ising character and interact mainly through magnetic dipolar fields. We used the muon spin relaxation technique to study the nature of its ground state for samples with x ≤ 0.25. In contrast with some previous works, we did not find canonical spin glass behavior down to ≈ 15 mK. Instead, below ≈300 mK we observed temperature-independent dynamic magnetism characterized by a single correlation time. The 300 mK energy scale corresponds to the Ho3+ hyperfine interaction strength, suggesting that this interaction may be involved in the dynamic behavior of the system.
LiHo(x)Y(1-x)F4 是一种绝缘体，其中磁性 Ho3+ 离子具有各向异性特征，主要通过磁偶极场相互作用。我们使用μ子自旋弛豫技术研究了 x ≤ 0.25 样品的基态性质。与之前的一些工作不同，我们没有在 ≈ 15 mK 以下发现典型的自旋玻璃行为。相反，在 ≈ 300 mK 以下，我们观察到以单个相关时间为特征的与温度无关的动态磁性。300 mK 的能量标度对应于 Ho3+ 超精细相互作用强度，这表明该相互作用可能参与了系统的动态行为。
