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arXiv 2009.07862cond-mat.supr-con
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反铁磁自旋涨落介导的超导电性的Schwinger玻色子研究

Schwinger boson study of superconductivity mediated by antiferromagnetic spin-fluctuations

Eirik Erlandsen, Asle Sudbø

摘要:

我们研究了正常金属中的超导性,这种超导性是由相邻反铁磁绝缘体中的自旋涨落介导的有效电子-电子相互作用引起的。在具有非补偿界面的Néel反铁磁体中引入次近邻相互作用,发现超导临界温度随着次近邻相互作用阻挫的增加而提高.此外,对于足够大的次近邻相互作用,反铁磁体被驱动到条纹相,这也可以引起吸引的电子-电子相互作用。对于条纹相,如以前报道的Néel相,超导临界温度被发现是放大的未补偿的界面,正常的金属传导电子耦合到两个子晶格的磁铁。由条纹相反铁磁体中的涨落引起的超导临界温度可以通过接近Néel相的转变而进一步提高。

英文摘要:

We study superconductivity in a normal metal, arising from effective electron-electron interactions mediated by spin-fluctuations in a neighboring antiferromagnetic insulator. Introducing a frustrating next-nearest neighbor interaction in a Néel antiferromagnet with an uncompensated interface, the superconducting critical temperature is found to be enhanced as the frustration is increased. Further, for sufficiently large next-nearest neighbor interaction, the antiferromagnet is driven into a stripe phase, which can also give rise to attractive electron-electron interactions. For the stripe phase, as previously reported for the Néel phase, the superconducting critical temperature is found to be amplified for an uncompensated interface where the normal metal conduction electrons are coupled to only one of the two sublattices of the magnet. The superconducting critical temperature arising from fluctuations in the stripe phase antiferromagnet can be further enhanced by approaching the transition back to the Néel phase.

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