实现室温超导的前景
Prospects to attain room temperature superconductivity
摘要：
利用电子-声子谱密度的一般模型，导出了两个简单的计算常规超导体转变温度和带隙温度比的表达式。它们要求声子交换因子$λ$的平均数值被限制在2.67，使得在可能涉及或可能不涉及氢的材料中，仅在德拜温度为约1800 K或更高时才可获得室温超导性。它们还表明，Be-Pb合金在$\sim$ 44 K下可能成为超导体。
英文摘要：
With a generic model for the electron-phonon spectral density, two simple expressions are derived to estimate the transition temperature and gap-to-temperature ratio in conventional superconductors. They entail that on average the numerical value of the phonon exchange factor, $λ$, is limited to 2.67, so that room temperature superconductivity may be attained only with a Debye temperature of about 1800 K or higher, in materials that may or may not involve hydrogen. They also show that a Be-Pb alloy may become a superconductor at $\sim$44 K.
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