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 0708.1966cond-mat.supr-concond-mat.str-el
收藏

铜氧化物超导体中调制棋盘图案与中子散射共振峰的不相容性

Incompatibility of modulated checkerboard patterns with the neutron scattering resonance peak in cuprate superconductors

D. X. Yao, E. W. Carlson

摘要:

为了解释铜酸盐BSCCO和Na-CCOC的STM实验,提出了生物棋盘图案。然而,这些图案的存在还没有被证实的散装探针,如中子散射。特别地,简单的棋盘图案与中子散射数据不一致,因为它们具有从电荷IC峰的方向旋转45度的低能量不平衡(IC)自旋峰。然而,目前还不清楚其他棋盘模式是否可以解决这个问题。本文用自旋波理论研究了更复杂的棋盘格图案(“调制棋盘格”),并分析了非共线棋盘格图案。我们发现,调制棋盘格的高能量响应与中子散射结果是不一致的,因为它们没有表现出共振峰(π,π),这是最近被证明是一个普遍的功能的铜氧化物超导体。我们进一步认为,新提出的非共线棋盘也缺乏共振峰。因此,我们的结论是,迄今为止,没有棋盘图案已被提出,满足低能量的约束和高能量的约束所施加的电流体的实验数据在铜氧化物超导体。

英文摘要:

Checkerboard patterns have been proposed in order to explain STM experiments on the cuprates BSCCO and Na-CCOC. However the presence of these patterns has not been confirmed by a bulk probe such as neutron scattering. In particular, simple checkerboard patterns are inconsistent with neutron scattering data, in that they have low energy incommsensurate (IC) spin peaks rotated 45 degrees from the direction of the charge IC peaks. However, it is unclear whether other checkerboard patterns can solve the problem. In this paper, we have studied more complicated checkerboard patterns ("modulated checkerboards") by using spin wave theory and analyzed noncollinear checkerboards as well. We find that the high energy response of the modulated checkerboards is inconsistent with neutron scattering results, since they fail to exhibit a resonance peak at (pi,pi), which has recently been shown to be a universal feature of cuprate superconductors. We further argue that the newly proposed noncollinear checkerboard also lacks a resonance peak. We thus conclude that to date no checkerboard pattern has been proposed which satisfies both the low energy constraints and the high energy constraints imposed by the current body of experimental data in cuprate superconductors.

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。

↑