Polarons, Bipolarons, and Possible High-Tc Superconductivity in Metal-Ammonia Solutions
Polarons, Bipolarons, and Possible High-Tc Superconductivity in Metal-Ammonia Solutions
复制标题
金属氨溶液中的极化子、双极化子和可能的高温超导性
DOI：
10.1023/a:1026494022982
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
P. Edwards
中科院分区：
文献类型：
--
作者：
P. Edwards
我们研究流体金属氨溶液的性质，特别强调极化子和双极化电荷载流子的电子结构和动力学。重要的是，我们发现，在低温（约 240K）下流体中接近成分诱导的非金属到金属转变时，绝大多数（约 85% 或以上）载流子是高度移动的反磁性 (S = 0) 双极子。这提出了 R. A. Ogg 于 1946 年首次提出的有趣的可能性，即玻璃态淬火金属氨溶液中捕获电子对的玻色-爱因斯坦凝聚 (BEC)。从“现代”（2000）的角度来看，我们认为与结晶层状铜酸盐的情况有重要的相似之处，我们在其他地方争论过高温超导源于电子活性 CuO2 平面中双极子的 BEC [A. S. Alexandrov 和 P. P. Edwards，Physica C331, 97 (2000)]。我们现在建议开始寻找淬火金属氨和相关解决方案的高温超导性。
We examine the nature of fluid metal-ammonia solutions with a special emphasis on the electronic structure and dynamics of polaronic and bipolaronic charge carriers. Importantly, we find that close to the compositionally-induced Nonmetal-to-Metal Transition in the fluid at low temperatures (ca. 240K), the vast majority (ca. 85% or above) of current carriers are highly mobile, diagmagnetic (S = 0) bipolarons. This raises the intriguing possibility, first proposed by R. A. Ogg in 1946, of a Bose–Einstein Condensation (BEC) of trapped electron pairs in vitreous, quenched metal-ammonia solutions. From a “modern” (2000) perspective we believe that there are important similarities to the situation in the crystalline layered cuprates, where we have argued elsewhere that High-Tc superconductivity derives from the BEC of bipolarons in the electronically active CuO2 planes [A. S. Alexandrov and P. P. Edwards, Physica C331, 97 (2000)]. We now propose that the search begins for high temperature superconductivity in quenched metal-ammonia and related solutions.