Superconductivity, magnetic ordering and non-Fermi-liquid effects in heavy-fermion metals
Superconductivity, magnetic ordering and non-Fermi-liquid effects in heavy-fermion metals
复制标题
重费米子金属中的超导性、磁有序性和非费米液体效应
DOI：
10.1016/s0304-8853(00)00601-6
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发表时间：
2001
影响因子：
2.7
通讯作者：
F. Steglich
中科院分区：
文献类型：
--
作者：
F. Steglich
重费米子（HF）现象发生在f电子化合物中，通常在TN以下形成的长程反铁磁（AF）有序附近。在TN→0的“磁不稳定性”附近，低的和空间扩展的大幅度AF自旋涨落通常被认为是非常规正常态的原因，有时也被认为是超导低T态的原因。通过讨论一些典型的化学计量比的化合物（CeCu 2Si 2，CeNi 2Ge 2和YbRh 2Si 2），我们将认为，除了巡回AF自旋波动，当地的f-自由度可能发挥上述现象的重要作用。与铜酸盐超导体相比，它们的HF对应物表现出惊人的非普适性。
Heavy-fermion (HF) phenomena occur in f-electron compounds usually in the vicinity of long-range antiferromagnetic (AF) ordering which forms below TN. Near a ‘magnetic instability’ where TN→0, low-lying and spatially extended AF spin fluctuations of large amplitude are usually considered to be the cause for an unconventional normal state and, sometimes, for superconducting low-T states. By discussing a number of prototypical stoichiometric compounds (CeCu2Si2, CeNi2Ge2and YbRh2Si2) we will argue that, in addition to the itinerant AF spin fluctuations, local f-degrees of freedom may play an essential role for the above phenomena. Compared to the cuprate superconductors, their HF counterparts behave strikingly non-universally.