论文标题
非fermi液体系统CECO $ _ {2} $ ga $ _ {8} $使用$μ$ $ sr进行的量子波动
Quantum Fluctuations in the Non-Fermi Liquid System CeCo$_{2}$Ga$_{8}$ Investigated Using $μ$SR
论文作者
论文摘要
降低的尺寸为确定重型费米材料中量子基态的类型提供了关键信息。在这里，我们检查了化学计量学CECO $ _ {2} $ ga $ _ {8} $化合物，该化合物在沿$ C $轴的Ga-Ce-Co链中以准二维晶体结构结晶。磁化率（$χ\ sim- \ ln t $），热容量（$ C_P/T \ sim- \ ln T $）和电阻率（$ρ\ sim t^{n} $）的低温行为（$ c_p/t \ sim- \ ln t $）牢固地确认了ceco $ _ {2} $ ga $ ga $ ga} $ _ {8} $ _ {8} $ _ {8} $ _ {8} $ {8}。我们研究了Ceco $ _ {2} $ ga $ _ {8} $复合利用零字段（ZF-）和纵向场（LF-）MUON旋转松弛（$μ$ $ SR）测量的低能旋转动力学。 ZF- $ $ $ SR的测量表明，没有远距离磁性订购降至70 mk，有趣的是，电子放松率急剧上升，从而暗示了CECO $ _ {2} $ GA $ ga $ _ {8} $ _ {2} $ _ {8} $的低能量子自旋波动的出现。
Reduced dimensionality offers a crucial information in deciding the type of the quantum ground state in heavy fermion materials. Here we have examined stoichiometric CeCo$_{2}$Ga$_{8}$ compound, which crystallizes in a quasi-one-dimensional crystal structure with Ga-Ce-Co chains along the $c$-axis. The low-temperature behavior of magnetic susceptibility ($χ\sim-\ln T$), heat capacity ($C_p/T\sim-\ln T$), and resistivity ($ρ\sim T^{n}$) firmly confirm the non-Fermi liquid ground state of CeCo$_{2}$Ga$_{8}$. We studied the low-energy spin dynamics of CeCo$_{2}$Ga$_{8}$ compound utilizing zero field (ZF-) and longitudinal field (LF-) muon spin relaxation ($μ$SR) measurements. ZF-$μ$SR measurement reveals the absence of long-range magnetic ordering down to 70 mK, and interestingly below 1 K, the electronic relaxation rate sharply rises, intimating the appearance of low energy quantum spin fluctuations in CeCo$_{2}$Ga$_{8}$.
