铜酸盐动力学和热力学性质的联系;（CaLa）（BaLa）$_{2}$ Cu $_{3}$ O $_{y}$的PDKEEPAAA研究
Linking Dynamic and Thermodynamic Properties of Cuprates; an ARPES study of (CaLa)(BaLa)$_{2}$Cu$_{3}$O$_{y}$
摘要：
本文报道了两族高温超导体（Ca $_{x}$ La $_{1-x}$）（Ba $_{1.75-x}$ La $% _{0.25+x}$）Cu $_{3}$ O $_{y}$与$x=0.1$（$T_{c}^{max}=56$ K）和$x=0.4$（$% T_{c}^{max}=82$ K）的角分辨光电子能谱（ARPES）。费米面（FS）被发现是独立的$x$或$y$，其大小表明极端的样品表面过掺杂。这种普遍的FS允许类似的结构和相同的掺杂，但不同的$% T_{c}^{max}$的超导体之间的动力学性质的比较。我们发现，高能量（$\left\vert E\right\vert >50$ % meV）的节速度在$x=0.4$家庭是高于在$x=0.1$家庭。$T_{c}^{max}$和$% t $之间的相关性支持动能驱动的铜氧化物超导性的概念。我们还发现$x=0.4$家族的波腹间隙更高。
英文摘要：
We report angle-resolved photoemission spectroscopy (ARPES) on two families of high temperature superconductors (Ca$_{x}$La$_{1-x}$)(Ba$_{1.75-x}$ La $% _{0.25+x}$)Cu$_{3}$O$_{y}$ with $x=0.1$ ($T_{c}^{max}=56$ K) and $x=0.4$ ($% T_{c}^{max}=82$ K). The Fermi surface (FS) is found to be independent of $x$ or $y$, and its size indicates extreme sample-surface overdoping. This universal FS allowes the comparison of dynamical properties between superconductors of similar structure and identical doping, but different $% T_{c}^{max}$. We find that the high-energy ($\left\vert E\right\vert >50$% meV) nodal velocity in the $x=0.4$ family is higher than in the $x=0.1$ family. The implied correlation between $T_{c}^{max}$ and the hopping rate $% t $ supports the notion of kinetic energy driven superconductivity in the cuprates. We also find that the antinodal gap is higher for the $x=0.4$ family.
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