论文标题
$ t $* - 类型la $ _ {1-x/2} $ eu $ _ {1-x/2} $ sr $ _x $ cuo $ _4 $通过元素替代对磁性的效果显示
Fermi-liquid state in $T$*-type La$_{1-x/2}$Eu$_{1-x/2}$Sr$_x$CuO$_4$ revealed via element substitution effects on magnetism
论文作者
论文摘要
尽管具有独特的结构特征，但迄今尚未研究具有五个氧气协调（$ t $* - 类型结构）的单层铜酸盐的磁性。在这里，我们报告了MUON自旋放松和磁化能力测量的结果，以阐明$ t $* - 类型La $ _ {1-x/2} $ _ {1-x/2} $ _ {1-x/2} $ _x $ _x $ _x $ _x $ cuo $ _4 $（lesco）通过磁性fe-lesco（lesco）通过磁性fe-fe-（lesco）通过Zn-sagneticitition和非Magagnetitition。我们澄清了旋转玻璃（SG）的诱导状态，以LA $ _ {1-x/2} $ _ $ _ {1-x/2} $ _ {1-x/2} $ _x $ _x $ _x $ _x $ _y $ _y $ _y $ _y $ fe $ _ {1-y} la $ _ {1-x/2} $ eu $ _ {1-x/2} $ sr $ _x $ _x $ cu $ _y $ zn $ _ {1-y} $ _4 $，$ x $ = 0.24，在抑制$ y $ $ $ $ $ $ \ egq $ 0.025之后，$ x $ = 0.24。 SG州位于$ \ sim $ 7 K以下，宽阔的SR浓度范围在0.19至0.34之间，5 $ \％$ \％$ fe-fe-fe-sud-sub-sub-substued lesco。短距离SG状态与金属状态的Ruderman-Kiter-kasuya-Yosida相互作用源于ruderman-kittel-kasuya-yosida。因此，结果为原始$ t $* - 类型Lesco提供了费米液体（FL）状态的第一个证据。考虑到氧$ k $ - 边缘X射线吸收光谱测量的结果$ [$ j。物理。 Soc。 JPN。 89，075002（2020）$] $报告LESCO的实际孔浓度，我们的结果表明，FL状态存在于较低的孔集合区域中，而$ t $ type la $ _ {2-x} $ _x $ sr $ _x $ _x $ _x $ cuo $ _4 $ _4 $ _4 $ _4 $。 FL状态在较低孔浓缩区域中的出现可能与五个氧气配位的母体材料中的电荷转移差距较小有关。
Despite its unique structural features, the magnetism of single-layered cuprate with five oxygen coordination ($T$*-type structure) has not been investigated thus far. Here, we report the results of muon spin relaxation and magnetic susceptibility measurements to elucidate the magnetism of $T$*-type La$_{1-x/2}$Eu$_{1-x/2}$Sr$_x$CuO$_4$ (LESCO) via magnetic Fe- and non-magnetic Zn-substitution. We clarified the inducement of the spin-glass (SG)-like magnetically ordered state in La$_{1-x/2}$Eu$_{1-x/2}$Sr$_x$Cu$_y$Fe$_{1-y}$O$_4$ with $x = 0.24 + y$, and the non-magnetic state in La$_{1-x/2}$Eu$_{1-x/2}$Sr$_x$Cu$_y$Zn$_{1-y}$O$_4$ with $x$ = 0.24 after the suppression of superconductivity for $y$ $\geq$ 0.025. The SG state lies below $\sim$7 K in a wide Sr concentration range between 0.19 and 0.34 in 5$\%$ Fe-substituted LESCO. The short-range SG state is consistent with that originating from the Ruderman-Kittel-Kasuya-Yosida interaction in a metallic state. Thus, the results provide the first evidence for Fermi liquid (FL) state in the pristine $T$*-type LESCO. Taking into account the results of an oxygen $K$-edge X-ray absorption spectroscopy measurement $[$J. Phys. Soc. Jpn. 89, 075002 (2020)$]$ reporting the actual hole concentrations in LESCO, our results demonstrate the existence of the FL state in a lower hole-concentration region, compared to that in $T$-type La$_{2-x}$Sr$_x$CuO$_4$. The emergence of the FL state in a lower hole-concentration region is possibly associated with a smaller charge transfer gap energy in the parent material with five oxygen coordination.
