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arXiv 1202.2480cond-mat.supr-con
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高温超导理论:Tc的精确预测

Theory of High-Tc Superconductivity: Accurate Predictions of Tc

Dale R. Harshman, Anthony T. Fiory

摘要:

基于铜、铁、钌和某些有机分子的高Tc化合物的超导转变温度被发现取决于键长、离子价和相邻空间分离层中电子带之间的库仑耦合[1]。最佳转变温度,记为T_c0,由普适表达式$k_BT_c0 = e^2 Λ/ \ellζ$给出; $\ell$是层内相互作用电荷之间的间距,λ是相互作用层之间的距离,Λ是普适常数,约等于约化电子康普顿波长的两倍(表明康普顿散射在配对中起作用)。样品降解明显的非最佳化合物通常表现出Tc < T_c0。对于所测试的31+种最佳化合物,理论和实验T_c0在统计上一致在+/-1.4K内。高Tc的基本结构单元由两个相邻的、空间上分离的电荷层组成;因子e^2/ε由它们之间的库仑力产生。理论电荷结构代表一个室温超导体也提出。

英文摘要:

The superconducting transition temperatures of high-Tc compounds based on copper, iron, ruthenium and certain organic molecules are discovered to be dependent on bond lengths, ionic valences, and Coulomb coupling between electronic bands in adjacent, spatially separated layers [1]. Optimal transition temperature, denoted as T_c0, is given by the universal expression $k_BT_c0 = e^2 Λ/ \ellζ$; $\ell$ is the spacing between interacting charges within the layers, ζis the distance between interacting layers and Λis a universal constant, equal to about twice the reduced electron Compton wavelength (suggesting that Compton scattering plays a role in pairing). Non-optimum compounds in which sample degradation is evident typically exhibit Tc < T_c0. For the 31+ optimum compounds tested, the theoretical and experimental T_c0 agree statistically to within +/- 1.4 K. The elemental high Tc building block comprises two adjacent and spatially separated charge layers; the factor e^2/ζarises from Coulomb forces between them. The theoretical charge structure representing a room-temperature superconductor is also presented.

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