论文标题
重型费米材料的北部效果的普遍行为
Universal behavior in the Nernst effect of heavy fermion materials
论文作者
论文摘要
我们报告了在重型费米昂材料中广泛的中等温度范围内的nernst系数的普遍缩放，包括超导体CECU $ _2 $ _2 $ _2 $ si $ _2 $，CECOIN $ _5 $，CE $ _2 $ _2 $ _2 $ _2 $ pdin $ _8 $ _8 $ ceru $ _2 $ si $ _2 $，中级Valent ybal $ _3 $和隐藏的订单复合uru $ _2 $ si $ _2 $，涵盖具有不同晶体，价值，价值和地面状态的大量繁重的费米昂材料。缩放公式正好遵循两流体模型中预测的新出现重型准颗粒的磁敏感性。我们根据偏斜的散射机制和玻尔兹曼的图片对缩放的暂定解释，并认为Nernst效应是由状态的准粒子密度的不对称性而不是散射速率的不对称产生的。在URU $ _2 $ SI $ _2 $中，还发现隐藏顺序阶段中的巨型Nernst信号遵循预测的缩放，表明杂交物理学的潜在参与。我们的工作提出了一个候选统一的场景，以实现重型费米材料中的北部效果。
We report the observation of a universal scaling of the Nernst coefficient over a wide intermediate temperature range in heavy fermion materials, including the superconductors CeCu$_2$Si$_2$, CeCoIn$_5$, and Ce$_2$PdIn$_8$, the ferromagnetic Kondo lattice Ce$_3$RhSi$_3$, the nonmagnetic CeRu$_2$Si$_2$, the intermediate valent YbAl$_3$, and the hidden order compound URu$_2$Si$_2$, that cover a broad spectrum of heavy fermion materials with different crystal, valence and ground state properties. The scaling formula follows exactly the magnetic susceptibility of emergent heavy quasiparticles as predicted in the two-fluid model. We give a tentative explanation of the scaling based on the skew scattering mechanism and the Boltzmann picture and argue that the Nernst effect is produced by the asymmetry of the quasiparticle density of states rather than that of the scattering rate. In URu$_2$Si$_2$, the giant Nernst signal in the hidden order phase is also found to follow the predicted scaling, indicating the potential involvement of hybridization physics. Our work suggests a candidate unified scenario for the Nernst effect in heavy fermion materials.
