高温氧化物超导体中的氧同位素效应。
Oxygen isotope effect in high-temperature oxide superconductors.
作者信息
Loye H C, Leary K J, Keller S W, Ham W K, Faltens T A, Michaels J N, Stacy A M
出版信息
Science. 1987 Dec 11;238(4833):1558-60. doi: 10.1126/science.238.4833.1558.
The effect of oxygen isotope substitution on the superconducting transition temperature, T(c), has been measured for BaBi(0.25)Pb(0.75)O(3) (T(c), approximately 11 K) and Lal(1.85) Ca(0.15)CuO(4) (T(c) approximately 20 K), and is compared to the shifts observed for La(1.85)Sr(0.15)CuO(4) (T(c) approximately 37 K) and YBa(2)Cu(3)O(7) (T(c) approximately 92 K). For all four materials, the transition temperature is shifted to lower temperature upon substitution of oxygen-18 for oxygen-16. The observed shifts demonstrate that phonons are involved in the electron-pairing mechanism in these oxide superconductors.
已对BaBi(0.25)Pb(0.75)O₃（Tc约为11K）和La₁.₈₅Ca₀.₁₅CuO₄（Tc约为20K）测量了氧同位素取代对超导转变温度Tc的影响，并与在La₁.₈₅Sr₀.₁₅CuO₄（Tc约为37K）和YBa₂Cu₃O₇（Tc约为92K）中观察到的转变温度变化进行了比较。对于所有这四种材料，用¹⁸O取代¹⁶O后，转变温度均向低温方向移动。观察到的这种变化表明，声子参与了这些氧化物超导体中的电子配对机制。
Zotero 插件