arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1111.1860cond-mat.supr-con
收藏

超导邻近效应对$_{y}$ Fe $_{2-x}$-Se $_{2}$块体反铁磁性的影响

Superconducting proximity effect to the block antiferromagnetism in K$_{y}$Fe$_{2-x}$Se$_{2}$

Hong-Min Jiang, Wei-Qiang Chen, Zi-Jian Yao, Fu-Chun Zhang

摘要:

最近发现的三元铁硒化物超导体具有块反铁磁(AFM)长程序.许多实验表明可能的介观相分离的超导性和反铁磁性,而中子实验揭示了一个相当大的抑制磁矩由于超导性表明可能的相共存。在这里,我们建议,所观察到的抑制的磁矩可以解释由于邻近效应内的相位分离的情况。我们采用双轨道模型研究了相邻SC层通过层间隧穿机制对一层块AFM态的邻近效应。我们认为,在三元铁硒化物的邻近效应应该是大的,因为大的层间耦合和弱的电子相关。将平均场论的结果与中子实验作了半定量的比较。由于SC邻近效应的磁矩的抑制被发现是更明显的d波超导性,并可能会增强由块AFM状态的受抑结构。

英文摘要:

Recent discovery of superconducting (SC) ternary iron selenides has block antiferromagentic (AFM) long range order. Many experiments show possible mesoscopic phase separation of the superconductivity and antiferromagnetism, while the neutron experiment reveals a sizable suppression of magnetic moment due to the superconductivity indicating a possible phase coexistence. Here we propose that the observed suppression of the magnetic moment may be explained due to the proximity effect within a phase separation scenario. We use a two-orbital model to study the proximity effect on a layer of block AFM state induced by neighboring SC layers via an interlayer tunneling mechanism. We argue that the proximity effect in ternary Fe-selenides should be large because of the large interlayer coupling and weak electron correlation. The result of our mean field theory is compared with the neutron experiments semi-quantitatively. The suppression of the magnetic moment due to the SC proximity effect is found to be more pronounced in the d-wave superconductivity and may be enhanced by the frustrated structure of the block AFM state.

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。

↑