On the Heavy Fermion Road
On the Heavy Fermion Road
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DOI：
10.1016/s0079-6417(05)15002-1
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发表时间：
2005-01
期刊：
影响因子：
--
通讯作者：
J. Flouquet
中科院分区：
文献类型：
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作者：
J. Flouquet
对格勒诺布尔经常研究的重费米子性质进行了评述。以低温奇异物质为例，提出了物理问题，并提出了三个主要见解：4f电子的局域化，远程磁序的坍塌和中间价态的入口。将讨论量子相变的一阶或二阶性质的问题。在第一个例子中，CeRu2Si2的伊辛近藤晶格，实验似乎是用4f巡回电子由它们的自旋涨落控制的图像来描述的；磁场中磁致伸缩与开关之间磁相互作用的强反馈说明了量子临界场的接近性。与CeCu6或YbRh2Si2系列进行比较，似乎出现了局部临界的想法。本文讨论了打破Yb重费米子系统是铈重费米子空穴类似物的观点的基本论据。特别关注的是非常规超导性和磁性之间的相互作用，无论是主要的反铁磁相关性还是铁磁相关性。巨大的电子格鲁尼森参数往往导致伴随的强密度和自旋涨落>。准二维ce115化合物等新材料的发现或最近发现的CePt3 Si或skutterudites对理论发展的推动作用是惊人的。最后，UPt3, URu2Si2， UPd2Al3和UBe13的典型案例为非常规超导体的丰富领域提供了坚实的基础。
The heavy fermion properties are reviewed on selected examples often studied in Grenoble. The physical problems are presented as example of exotic matter at low temperature with three major insights: the localisation of the 4f electrons, the collapse of the long range magnetic order and the entrance in an intermediate valence regime. The question on the first or second order nature of the quantum phase transition will be discussed. In the first example, the Ising Kondo lattice of CeRu2Si2, experiments seem to be described with the picture of 4f itinerant electron dominated by their spin fluctuations; the strong feedback, induced in magnetic field, between magnetostriction and switch in the nature of the magnetic interactions illustrates the proximity of a quantum critical field. Comparison is made with CeCu6 or YbRh2Si2 series where the idea of local criticality seems to emerge. Basic arguments are discussed for the breakdown of the idea that Yb heavy fermion systems are the the hole analogue of the cerium ones. Special focus is given on the interplay between unconconventional superconductivity and magnetism either for dominant antiferromagnetic or ferromagnetic correlations. Huge electronic Gruneisen parameter leads often to strong concomitant 4f density and spin fluctuations >.The main boost given by the discovery of new materials as quasi-bidimensional Ce 115 compounds or recently by CePt3 Si or skutterudites is spectacular for the theoretical developments. Finally, the now canonical cases of the UPt3, URu2Si2, UPd2Al3 and UBe13 give now a sound basis in the rich domain of unconventional superconductors.