$T_c$对自旋涨落谱的$q-ω$结构的依赖性
Dependence of $T_c$ on the $q-ω$ structure of the spin-fluctuation spectrum
摘要：
基于${\rm YBCO}_{6.6}(T_c=61K)$的非弹性中子散射（INS）和角分辨光电子能谱（ARPES）的唯象自旋涨落分析（参考文献1），计算了70 K时线性化能隙方程的d波本征值$λ_d$对自旋磁化率$χ''(q,ω)$虚部的泛函导数。对于接近$T_c$的温度，$T_c$相对于$χ''(q,ω)$的变化与该函数导数成比例。在此基础上，讨论了YBCO $_{6.6}$的$q$和$ω$自旋涨落谱的不同部分对$T_c$的贡献。
英文摘要：
A phenomenological spin-fluctuation analysis (Ref. 1), based upon inelastic neutron scattering (INS) and angular resolved photoemission spectroscopy (ARPES) data for ${\rm YBCO}_{6.6}(T_c=61K)$, is used to calculate the functional derivative of the d-wave eigenvalue $λ_d$ of the linearized gap equation with respect to the imaginary part of the spin susceptibility $χ''(q,ω)$ at 70K. For temperatures near $T_c$, the variation of $T_c$ with respect to $χ''(q,ω)$ is proportional to this functional derivative. Based on this, we discuss how different parts of the $q$ and $ω$ dependent spin-fluctuation spectrum of YBCO$_{6.6}$ contribute to $T_c$.
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