Exotic superconducting mechanisms in Fe and CeCu₂Si₂ under pressure
Exotic superconducting mechanisms in Fe and CeCu₂Si₂ under pressure
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压力下 Fe 和 CeCu2Si2 的奇异超导机制
DOI：
10.13097/archive-ouverte/unige:284
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发表时间：
2004
期刊：
影响因子：
2.7
通讯作者：
A. Holmes
中科院分区：
文献类型：
--
作者：
A. Holmes
本文试图回答一个问题：e-iron和CeCu2Si2的超导机制是什么？有很多理由认为，在这两个系统中，它都不是传统的bcs类型的机制。压力使我们能够连续地改变材料的电子特性，在量子不稳定性下，不同电子构型之间的波动很可能导致超导配对。在滑石和氦压力介质中进行了输运和量热测量。铁中最可能的配对机制是由磁波动介导的配对机制，我们已经得出结论，Fe是铁磁介导的自旋三重态超导体的可能性很大。虽然人们普遍认为CeCu2Si2在环境压力下的超导性是由反铁磁自旋涨落介导的，但我们得出结论，高压下的配对是由一种新的机制负责的，这种机制是基于价涨落交换的吸引相互作用。
This thesis attempts to answer the question: what is the superconducting mechanism in e-iron and CeCu2Si2? There are many reasons to think that it is not a conventional BCS-type mechanism in either system. Pressure enables us to continuously vary the electronic properties of a material, and fluctuations between different electronic configurations at a quantum instability are likely to cause the superconducting pairing. Transport and calorimetry measurements were carried out in steatite and helium pressure media. The most likely pairing mechanism in Fe is that mediated by magnetic fluctuations, and we have concluded that there is a strong possibility of e-Fe being a ferromagnetically mediated spin-triplet superconductor. While it is widely accepted that in CeCu2Si2 the superconductivity at ambient pressure is mediated by antiferromagnetic spin fluctuations, we conclude that a new mechanism is responsible for the pairing at high pressure, with the attractive interaction based on the exchange of valence fluctuations.
高压下ε-铁的非常规超导性和非费米液体行为
DOI：
--
发表时间：
2004
期刊：
J.Phys. : Condens.Matter 16
影响因子：
--
作者：
北山陽子;西脇妙子;里見佳典;寺内一姫;清原玲子;高尾敏文;近藤孝男;A.T.Holmes
通讯作者：
A.T.Holmes
影响因子：
3.7
作者：
Holmes, AT;Jaccard, D;Miyake, K
通讯作者：
Miyake, K
影响因子：
2.8
作者：
Miyake, K;Narikiyo, O;Onishi, Y
通讯作者：
Onishi, Y