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首页> 外文期刊>Physica status solidi, B. Basic research >Gordian knot in the pseudo-gap phase of hole-underdoped cuprates
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Gordian knot in the pseudo-gap phase of hole-underdoped cuprates

机译：空穴不足掺杂的铜酸盐的拟间隙相中的高迪安结

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摘要

We consider the coexistent d-density wave (DDW) order, at the anti-ferromagnetic (AF) wave vector Q=(π,π), representing the pseudo-gap (PG) state, and d-wave superconductivity (DSC), driven by an assumed attractive interaction, for the two-dimensional (2D) fermion system on a square lattice starting with a mean-field Hamiltonian involving the singlet DDW and the DSC pairings. The two energy gaps, corresponding to PG and DSC, in the excitation spectrum do not merge into one 'quadrature' gap if the normal state dispersion is imperfectly nested. With the pinning of the van Hove singularities (vHSs) of the dispersion close to the chemical potential (μ), we show that the PG and DSC are representing two competing orders as the former brings about a depletion of the spectral weight (a contour plot of the spectral weight density for 60K at the doping level ~10% is shown in the abstract figure) available for pairing in the anti-nodal region of momentum space in the coexistent state. The calculation of quasi-particle thermal conductivity α_(xx) in the DDW and normal phases via the Boltzmann equation in the relaxation-time approximation shows that there is a mild discontinuity in α_(xx) at the PG transition temperature T*.
机译：我们考虑在反铁磁（AF）波矢量Q =（π，π）处代表伪间隙（PG）状态的d密度波（DDW）阶和d波超导（DSC），在假定的吸引相互作用的驱动下，对于方格上的二维（2D）费米子系统，从涉及单重态DDW和DSC对的均值哈密顿量开始。如果不完全嵌套正常态色散，则激发光谱中与PG和DSC对应的两个能隙不会合并为一个“正交”能隙。通过固定分散体的van Hove奇异点（vHSs）接近化学势（μ），我们表明PG和DSC代表两个竞争顺序，因为前者引起光谱权重的耗尽（等高线图掺杂水平为〜10％时60K的光谱权重密度的示意图显示在共存状态下可用于动量空间的反节点区域中的配对。通过弛豫时间近似中的玻尔兹曼方程，在DDW和正相中的准粒子导热系数α_（xx）的计算表明，在PG转变温度T *处，α_（xx）的温和不连续性。

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