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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Nuclear magnetic resonance investigation of the novel heavy fermion system Ce$_{2}$CoAl$_{7}$Ge$_{4}$
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APS -APS March Meeting 2017 - Event - Nuclear magnetic resonance investigation of the novel heavy fermion system Ce$_{2}$CoAl$_{7}$Ge$_{4}$

机译：APS -APS 2017年3月会议-活动-新型重型费米子系统Ce $ _ {{2} $ CoAl $ _ {7} $ Ge $ _ {4} $的核磁共振研究

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摘要

We present nuclear magnetic resonance (NMR) measurements performed on single crystalline Ce$_{2}$CoAl$_{7}$Ge$_{4}$. This material is a member of a recently discovered family of heavy fermion materials Ce$_{2}$MAl$_{7}$Ge$_{4}$, where M $=$ Co, Ir, Ni, or Pd that crystallize in the noncentrosymmetric tetragonal space group P4 -21m. Previous measurements indicated a strong Kondo interaction, as well as magnetic ordering at 1.75 K. Our $^{59}$Co NMR spectral measurements reveal a Knight shift anomaly at T* extasciitilde 17.5 K for H$_{0}$ extbar extbar c, and 12.5 K for H$_{0}$ extbar extbar a associated with f-electron conduction electron coherence. Spin-lattice relaxation rate measurements indicate diverging spin fluctuations at a magnetic ordering temperature of 1.6 K. An analysis of the Korringa enhancement factor suggests that the character of the spin fluctuations is dominantly ferromagnetic.
机译：我们介绍了对单晶Ce $ _ {2} $ CoAl $ _ {7} $ Ge $ _ {4} $进行的核磁共振（NMR）测量。该材料是最近发现的重费米子材料Ce $ _ {{2} $ MAl $ _ {7} $ Ge $ _ {4} $族的成员，其中M $ = $ Co，Ir，Ni或Pd在非中心对称四边形空间群P4 -21m中结晶。先前的测量表明近藤相互作用很强，并且在1.75 K处有磁有序。我们的$ ^ {59} $ Co NMR光谱测量结果显示，对于H $ _ {0} $ extbar extbar c，T *引出点17.5 K处的奈特位移异常对于H $ _ {0} $ extbar extbar a为12.5 K，与f电子传导电子相干性相关。自旋晶格弛豫速率的测量结果表明，在1.6 K的磁性有序温度下，自旋波动发散。对Korringa增强因子的分析表明，自旋波动的特征主要是铁磁的。

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