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arXiv 1105.3987cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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电子掺杂氧化铜超导体中的电子-自旋激发耦合

Electron-Spin Excitation Coupling in an Electron Doped Copper Oxide Superconductor

Jun Zhao, F. C. Niestemski, Shankar Kunwar, Shiliang Li, P. Steffens, A. Hiess, H. J. Kang, Stephen D. Wilson, Ziqiang Wang, Pengcheng Dai, V. Madhavan

摘要:

铜氧化物的高温(高Tc)超导电性源于其反铁磁(AF)绝缘母体化合物的电子或空穴掺杂。AF相掺杂的演变及其与超导性的空间共存由电荷和自旋相关性的性质决定,并为高Tc超导性的机制提供线索。本文利用中子散射和扫描隧道能谱(STS)相结合的方法研究了氧退火过程中Pr_(0.88)LaCe_(0.12)CuO_(4-δ)超导体的Tc演化。我们发现,中子散射检测到的自旋激发有两个不同的模式,在一个非常相似的方式在STS中的电子隧穿模式与Tc的演变。这些结果表明,在纳米尺度上,反铁磁性和超导电性在局域上相互竞争,在空间上共存,在低能区主要的电子-玻色子耦合来自于电子-自旋激发.

英文摘要:

High-temperature (high-Tc) superconductivity in the copper oxides arises from electron or hole doping of their antiferromagnetic (AF) insulating parent compounds. The evolution of the AF phase with doping and its spatial coexistence with superconductivity are governed by the nature of charge and spin correlations and provide clues to the mechanism of high-Tc superconductivity. Here we use a combined neutron scattering and scanning tunneling spectroscopy (STS) to study the Tc evolution of electron-doped superconducting Pr0.88LaCe0.12CuO4-delta obtained through the oxygen annealing process. We find that spin excitations detected by neutron scattering have two distinct modes that evolve with Tc in a remarkably similar fashion to the electron tunneling modes in STS. These results demonstrate that antiferromagnetism and superconductivity compete locally and coexist spatially on nanometer length scales, and the dominant electron-boson coupling at low energies originates from the electron-spin excitations.

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。

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