Tuning the Pairing Interaction in a d-Wave Superconductor by Paramagnons Injected through Interfaces.
Tuning the Pairing Interaction in a d-Wave Superconductor by Paramagnons Injected through Interfaces.
复制标题
DOI：
10.1103/physrevlett.120.187002
复制
发表时间：
2017-12
影响因子：
8.6
通讯作者：
M. Naritsuka;P. Rosa;Yongkang Luo;Y. Kasahara;Y. Tokiwa;Takugo Ishii;S. Miyake;T. Terashima;T. Shibauchi;F. Ronning;J. Thompson;Y. Matsuda
中科院分区：
文献类型：
--
作者：
M. Naritsuka;P. Rosa;Yongkang Luo;Y. Kasahara;Y. Tokiwa;Takugo Ishii;S. Miyake;T. Terashima;T. Shibauchi;F. Ronning;J. Thompson;Y. Matsuda
非常规的超导性和磁性在微观层面上交织在一大类材料中。一种新的方法来解决这个最基本和激烈争论的问题，重点是在异质结构中相邻层之间的界面处超导电子和玻色子波动之间的相互作用的作用。本文制备了由重费米子超导体CeCoIn_{5}和反铁磁（AFM）金属CeRhIn_{5}交替原子层组成的混合超晶格，其中AFM有序可以通过施加压力来抑制。我们发现超导态和AFM态共存于空间分离的层中，但它们通过界面的相互耦合显著地改变了超导性质。对上临界场的分析表明，在施加压力抑制AFM阶数后，超导电子对的力束缚具有极强的耦合性质。这表明超导配对可以通过界面注入的磁波动（顺磁子）进行非平凡的调谐。
Unconventional superconductivity and magnetism are intertwined on a microscopic level in a wide class of materials. A new approach to this most fundamental and hotly debated issue focuses on the role of interactions between superconducting electrons and bosonic fluctuations at the interface between adjacent layers in heterostructures. Here we fabricate hybrid superlattices consisting of alternating atomic layers of the heavy-fermion superconductor CeCoIn_{5} and antiferromagnetic (AFM) metal CeRhIn_{5}, in which the AFM order can be suppressed by applying pressure. We find that the superconducting and AFM states coexist in spatially separated layers, but their mutual coupling via the interface significantly modifies the superconducting properties. An analysis of upper critical fields reveals that, upon suppressing the AFM order by applied pressure, the force binding superconducting electron pairs acquires an extreme strong-coupling nature. This demonstrates that superconducting pairing can be tuned nontrivially by magnetic fluctuations (paramagnons) injected through the interface.