arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.2410cond-mat.supr-concond-mat.str-el
收藏

存在对跳跃相互作用时的Fulde-Ferrell-Larkin-Ovchinnikov相

Fulde-Ferrell-Larkin-Ovchinnikov phase in the presence of pair hopping interaction

Andrzej Ptok, Maciej M. Maska, Marcin Mierzejewski

摘要:

最近的实验支持在CeCoIn 5中存在Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)相,将注意力转向负责这种类型超导性的机制。我们调查的FFLO状态在一个模型中,网站/网站间的配对与排斥对跳跃相互作用共存。后一种相互作用的有趣之处在于,即使在没有外部磁场的情况下,它也会导致库珀对的非零动量配对(所谓的η配对)。结果表明,根据对跳跃相互作用的强度,磁场可以诱导具有序参量的不同空间调制的两种类型的FFLO相位之一。有人认为,FFLO相位的属性可能会给对跳跃相互作用的幅度的信息。我们还表明,η-配对和d-波超导可能共存的FFLO状态。对于在没有磁场的情况下是纯d波型的超导体也是如此。

英文摘要:

The recent experimental support for the presence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase in the CeCoIn5 directed the attention towards the mechanisms responsible for this type of superconductivity. We investigate the FFLO state in a model where on--site/inter--site pairing coexists with repulsive pair hopping interaction. The latter interaction is interesting in that it leads to pairing with nonzero momentum of the Cooper pairs even in the absence of the external magnetic field (the so-called eta-pairing). It turns out that depending on the strength of the pair hopping interaction the magnetic field can induce one of two types of the FFLO phase with different spatial modulations of the order parameter. It is argued that the properties of the FFLO phase may give information about the magnitude of the pair hopping interaction. We also show that eta-pairing and d-wave superconductivity may coexist in the FFLO state. It holds true also for superconductors which in the absence of magnetic field are of pure d-wave type.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑