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首页> 外文期刊>Physica, B. Condensed Matter >Non-Fermi liquid phenomena and intermediate valence in Yb-based compounds located close to the quantum critical point
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Non-Fermi liquid phenomena and intermediate valence in Yb-based compounds located close to the quantum critical point

机译：位于量子临界点附近的Yb基化合物的非费米液体现象和中间价

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摘要

In this paper, we focus on the mechanism of non-Fermi liquid phenomena. in the vicinity of the magnetic field-tuned quantum critical point in Yb-based heavy fermion compounds YbAuCu4, YbRh2Si2 and YbFe4P12. A comparative study of YbAuCu4 and YbPdCu4 with differently magnetically ordered ground states of antiferromagnetic (AFM) and ferromagnetic (FM) indicates that the competition between the field-destabilized AFM and field-stabilized FM correlations plays an important role on the field-tuned quantum critical behavior. The non-integer valence of these compounds leads to a consideration that the experimental susceptibility is dominated by the weakly broadened 4f hole level above the Fermi sea that extends to the cf hybridized band located at the Fermi level. Whilst, the monotonic increase of T-0 (an estimate of Kondo temperature) with field, derived from the transport and spin-fluctuation measurements, is ascribed to the variation of conduction bands from a weakly cf hybridized band toward the originally underlying conduction bands. The important role of the crossover transition upon cooling from the mixed valence localized f hole state to an itinerant electron state with the intermediate valence is also suggested. (C) 2007 Elsevier B.V. All rights reserved.
机译：在本文中，我们关注非费米液体现象的机理。 Yb基重铁化合物YbAuCu4，YbRh2Si2和YbFe4P12的磁场调谐量子临界点附近。对YbAuCu4和YbPdCu4的反铁磁（AFM）和铁磁（FM）具有不同磁序基态的比较研究表明，场稳定的AFM和场稳定的FM相关之间的竞争在场调谐量子临界中起重要作用行为。这些化合物的非整数化合价导致人们认为，实验敏感性是由费米海上方弱扩展的4f孔水平主导的，该水平扩展至位于费米水平的cf杂合带。同时，由传输和自旋涨落测量得出的T-0随磁场的单调增加（近藤温度的估计值）归因于导带从弱cf杂化带向最初的基础导带的变化。还提出了在从混合价的局部化的f空穴状态冷却至具有中间价的流动电子状态时，交叉转变的重要作用。 （C）2007 Elsevier B.V.保留所有权利。

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