论文标题
通过sr $ _2 $ ru $ _ {1-x} m_x $ o $ $ $ _4 $（$ M = $ CO，MN）中的磁性波动增强的Seebeck系数
Enhanced Seebeck coefficient through the magnetic fluctuations in Sr$_2$Ru$_{1-x}M_x$O$_4$ ($M = $ Co, Mn)
论文作者
论文摘要
分层的Perovskite SR $ _2 $ ruo $ _4 $是最深入研究的超导体，但是其配对机制通常与相关材料中的磁波动紧密耦合，仍然是一个悬而未决的问题。在这里，我们介绍了Seebeck系数在共同和Mn取代的SR $ _2 $ ruo $ _4 $单晶中的系统演变，其中铁磁性和反铁磁性玻璃状态分别出现在父母化合物的超导阶段的附近。 We find that the Seebeck coefficient $S$ divided by temperature $T$, $S/T$, shows a maximum near characteristic temperatures seen in the irreversible magnetization $M_{\rm ir}$ in both of the Co- and Mn-substituted crystals, demonstrating both of the ferromagnetic and antiferromagnetic fluctuations to enhance the Seebeck coefficient.有趣的是，$ s/t $随着家长化合物中的温度降低而增加，让人联想到非fermi-liquid行为，这表明在SR $ _2 $ ruo $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ $ _4 $ _4 $ _4 $ y。
The layered perovskite Sr$_2$RuO$_4$ is a most intensively studied superconductor, but its pairing mechanism, which is often coupled intimately with magnetic fluctuations in correlated materials, is still an open question. Here we present a systematic evolution of the Seebeck coefficient in Co- and Mn-substituted Sr$_2$RuO$_4$ single crystals, in which ferromagnetic and antiferromagnetic glassy states respectively emerge in proximity to the superconducting phase of the parent compound. We find that the Seebeck coefficient $S$ divided by temperature $T$, $S/T$, shows a maximum near characteristic temperatures seen in the irreversible magnetization $M_{\rm ir}$ in both of the Co- and Mn-substituted crystals, demonstrating both of the ferromagnetic and antiferromagnetic fluctuations to enhance the Seebeck coefficient. Interestingly, $S/T$ increases with lowering temperature in the parent compound, reminiscent of non-Fermi-liquid behavior, indicating an essential role of coexisting ferromagnetic and antiferromagnetic fluctuations for the itinerant electrons in Sr$_2$RuO$_4$.
