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arXiv 0710.2638cond-mat.supr-concond-mat.str-el
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t-J双层膜中磁性与超导电性的共存

Coexistence of magnetism and superconductivity in a t-J bilayer

Amal Medhi, Saurabh Basu, C. Y. Kadolkar

摘要:

我们研究了双层材料中反铁磁和超导关联的共存,使用二维的t-J模型,通过变分Monte Carlo计算的层间耦合。据发现,欠掺杂制度支持共存相,超过该(d-波)超导状态变得稳定。进一步,详细研究了面间耦合参数作为空穴掺杂的函数对磁关联和超导关联的影响。的磁相关性被发现减少增加面间跳跃远离半填充,而跨层的交换加强面间反铁磁相关性在和远离半填充。超导相关性显示出更有趣的功能,其中较大的面间跳跃大大降低了平面相关性在最佳掺杂,而相反的行为,即稳定的超导状态是实现在过掺杂制度,与面间交换所有的同时发挥休眠的作用。

英文摘要:

We investigate coexistence of antiferromagnetic and superconducting correlations in bilayered materials using a two-dimensional t-J model with couplings across the layers using variational Monte Carlo calculations. It is found that the underdoped regime supports a coexisting phase, beyond which the (d-wave) superconducting state becomes stable. Further, the effects of interplanar coupling parameters on the magnetic and superconducting correlations as a function of hole doping are studied in details. The magnetic correlations are found to diminish with increasing interplanar hopping away from half filling, while the exchange across the layers strengthens interplanar antiferromagnetic correlations both at and away from half filling. The superconducting correlations show more interesting features where larger interplanar hopping considerably reduces planar correlations at optimal doping, while an opposite behaviour, i.e. stabilisation of the superconducting state is realised in the overdoped regime, with the interplanar exchange all the while playing a dormant role.

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