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arXiv 0812.3860cond-mat.supr-concond-mat.str-el
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高温超导体中自旋涨落介导的对相互作用的强度

Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor

T. Dahm, V. Hinkov, S. V. Borisenko, A. A. Kordyuk, V. B. Zabolotnyy, J. Fink, B. Büchner, D. J. Scalapino, W. Hanke, B. Keimer

摘要:

基于自旋涨落和费米准粒子之间耦合的理论是解释高温超导起源的主要竞争者之一,但对这种相互作用强度的估计差异很大。在这里,我们分析的电荷和自旋激发光谱确定的角度分辨光电发射和非弹性中子散射,分别在相同的晶体的高温超导体YBa2Cu3O6.6。我们表明,这两个光谱的自洽描述可以通过调整一个单一的参数,自旋费米子耦合常数。特别是,我们发现了两个光谱特征之间的定量联系,已被建立为普遍的铜酸盐,即高能自旋激发和“扭结”沿节方向的费米带色散。用此耦合常数计算的超导转变温度超过150 K,表明自旋涨落具有足够的强度来介导高温超导性。

英文摘要:

Theories based on the coupling between spin fluctuations and fermionic quasiparticles are among the leading contenders to explain the origin of high-temperature superconductivity, but estimates of the strength of this interaction differ widely. Here we analyze the charge- and spin-excitation spectra determined by angle-resolved photoemission and inelastic neutron scattering, respectively, on the same crystals of the high-temperature superconductor YBa2Cu3O6.6. We show that a self-consistent description of both spectra can be obtained by adjusting a single parameter, the spin-fermion coupling constant. In particular, we find a quantitative link between two spectral features that have been established as universal for the cuprates, namely high-energy spin excitations and "kinks" in the fermionic band dispersions along the nodal direction. The superconducting transition temperature computed with this coupling constant exceeds 150 K, demonstrating that spin fluctuations have sufficient strength to mediate high-temperature superconductivity.

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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