论文标题
避免巡回Ferromagnet sr $ _ {1-x} $（la $ _ {0.5} $ k $ _ {0.5} $）避免量子批判性和集群玻璃形成
Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr$_{1-x}$(La$_{0.5}$K$_{0.5}$)$_x$RuO$_3$
论文作者
论文摘要
我们证明，由于巡回的铁磁体SR1-X（LA0.5K0.5）XRUO3，避免了铁磁量子临界值时出现的集群玻璃状态。在这种化合物中，铁磁顺序通过增加x抑制，然后在临界浓度下消失：x = 0.5。在此X范围内，本研究表明，没有明显特征归因于特定热中的量子临界波动。取而代之的是，由于自发的自旋冷冻，AC磁敏感性表现出较大的峰值，并且峰温度显着取决于所施加的AC磁场的频率。此外，在较宽的温度范围内会增强特定热量，而特定的热量没有与自旋冷冻相关的显着异常。这些特征是集群玻璃形成的特征。特别是，Vogel-Fulcher定律很好地描述了AC磁敏感性的观察到的频率变化。我们比较有关这种掺杂化合物中抑制铁磁顺序的特征与同构和la掺杂的SrRRUO3中的特征，并建议局部相关障碍效应以及静止的RU 4D电子的相干性很小，而RU 4D电子的相干性很小，而不是cluster-g class形成，而不是Sruster-g class形成，而不是量子clastum clastum in sre sriention in sr1-sr1-sr15.5。5。
We demonstrate that the cluster-glass state emerges as ferromagnetic quantum criticality is avoided in itinerant ferromagnet Sr1-x(La0.5K0.5)xRuO3. In this compound, the ferromagnetic order is suppressed by increasing x, and then disappears at the critical concentration: x=0.5. In this x range, the present study reveals that no prominent feature is ascribed to the quantum critical fluctuations in specific heat. Instead, ac magnetic susceptibility exhibits a broad peak due to spontaneous spin freezing, and the peak temperature depends significantly on the frequency of the applied ac magnetic field. Furthermore, specific heat is enhanced within a wide temperature range, whereas specific heat shows no salient anomaly associated with spin freezing. These features are characteristics of the formation of cluster-glass; in particular, the observed frequency variations in ac magnetic susceptibility are well described by the Vogel-Fulcher law. We compare the features concerning the suppression of the ferromagnetic order in this doped compound with those in isostructural Ca- and La-doped SrRuO3, and suggest that a local correlated disorder effect and the very small coherence of itinerant Ru 4d electrons are responsible for the cluster-glass formation instead of the quantum phase transition in Sr1-x(La0.5K0.5)xRuO3.
