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 0708.0789cond-mat.supr-concond-mat.str-el
收藏

电子掺杂铜氧化物的点接触光谱理论

Theory of point contact spectroscopy in electron-doped cuprates

C. S. Liu, W. C. Wu

摘要:

在空穴掺杂的$d_{x^{2}-y^{2}}$波铜氧化物超导体中,由于中间带隙表面态(MSS)的存在,在[110]界面点接触谱(PCS)中广泛观察到零偏压电导峰(ZBCP)。然而,这种几何形状的ZBCP很少在电子掺杂的铜氧化物中观察到,即使它们的配对对称性仍然可能是$d_{x^{2}-y^{2}}$波。我们认为,这是由于反铁磁(AF)和超导(SC)订单的共存。推广的Blonder-Tinkham-Klapwijk(BTK)公式,包括AF耦合,它明确表明,MSS被破坏的AF顺序。计算的PCS与实验结果吻合较好。

英文摘要:

In the hole-doped $d_{x^{2}-y^{2}}$-wave cuprate superconductor, due to the midgap surface state (MSS), a zero bias conductance peak (ZBCP) is widely observed in [110] interface point contact spectroscopy (PCS). However, ZBCP of this geometry is rarely observed in the electron-doped cuprates, even though their pairing symmetry is still likely the $d_{x^{2}-y^{2}}$-wave. We argue that this is due to the coexistence of antiferromagnetic (AF) and the superconducting (SC) orders. Generalizing the Blonder-Tinkham-Klapwijk (BTK) formula to include an AF coupling, it is shown explicitly that the MSS is destroyed by the AF order. The calculated PCS is in good agreement with the experiments.

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。

↑