Relevance of ferromagnetic correlations for the electron spin resonance in Kondo lattice systems.
Relevance of ferromagnetic correlations for the electron spin resonance in Kondo lattice systems.
复制标题
铁磁相关性与近藤晶格系统中电子自旋共振的相关性。
DOI：
10.1103/physrevlett.100.066401
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发表时间：
2008
影响因子：
8.6
通讯作者：
J. Sichelschmidt
中科院分区：
文献类型：
--
作者：
C. Krellner;Tobias Foerster;H. Jeevan;C. Geibel;J. Sichelschmidt
铁磁（FM）近藤晶格系统CeRuPO的电子自旋共振（ESR）测量显示了一个明确的ESR信号，这是相关的Ce 3+磁性。相反，没有ESR可以观察到反铁磁（AFM）同系物CeOsPO。此外，我们检测到的ESR信号在铁磁性YbRh，而它是不存在的一些Ce或Yb金属间化合物与占主导地位的AFM交换。因此，在近藤晶格中观察到的ESR信号既不是特定于Yb，也不是接近量子临界点，但似乎与FM波动的存在有关。这些结论不仅提供了一个基本概念，以了解ESR在近藤晶格系统，甚至远低于近藤温度（如观察到的YbRh_2Si_2），但指出ESR作为一个主要的方法，直接调查的自旋动力学的近藤离子。
Electron spin resonance (ESR) measurements of the ferromagnetic (FM) Kondo lattice system CeRuPO show a well defined ESR signal which is related to the Ce3+ magnetism. In contrast, no ESR could be observed in the antiferromagnetic (AFM) homologue CeOsPO. Additionally, we detect an ESR signal in ferromagnetic YbRh while it was absent in a number of Ce or Yb intermetallic compounds with dominant AFM exchange. Thus, the observation of an ESR signal in a Kondo lattice is neither specific to Yb nor to the proximity to a quantum critical point, but seems to be connected to the presence of FM fluctuations. These conclusions not only provide a basic concept to understand the ESR in Kondo lattice systems even well below the Kondo temperature (as observed in YbRh2Si2) but point out ESR as a prime method to investigate directly the spin dynamics of the Kondo ion.