STRUCTURAL AND ELECTRONIC PROPERTIES OF THE NONCUBIC SUPERCONDUCTING FULLERIDES A'4C60 (A' = BA, SR)
STRUCTURAL AND ELECTRONIC PROPERTIES OF THE NONCUBIC SUPERCONDUCTING FULLERIDES A'4C60 (A' = BA, SR)
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非立方超导富勒烯 A4C60 (A = BA, SR) 的结构和电子性能
DOI：
10.1103/physrevlett.83.2258
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发表时间：
1999
影响因子：
8.6
通讯作者：
P. Pattison
中科院分区：
文献类型：
--
作者：
C. Brown;S. Taga;B. Gogia;K. Kordatos;S. Margadonna;K. Prassides;Y. Iwasa;K. Tanigaki;A. Fitch;P. Pattison
非立方碱富勒化物a4c60 （A= K, Rb, Cs）中超导性的缺失与电子相关和电子-声子相互作用对窄t1导带的影响有关。我们发现结构相关的碱土富勒化物，a4 ' c60 （A ' = Sr, Ba）是超导的，在费米能级N ε f的态密度值很小，Ba 2+离子与邻近的c60单元在ba4 ' c60中紧密接触意味着强烈的轨道杂化，这显然是稳定非立方超导相的原因，与绝缘的a4 ' c60相反。
The absence of superconductivity in noncubic alkali fullerides, A 4 C 60 (A= K, Rb, Cs) has been associated with the effects of electron correlation and electron-phonon interaction on the narrow t 1 u-derived conduction band. We find that the structurally related alkaline earth fullerides, A 4′ C 60 (A′= Sr, Ba), are superconducting with small values of the densities of states at the Fermi level, N ε F. Close contacts between Ba 2+ ions and neighboring C 60 units in Ba 4 C 60 imply a strong orbital hybridization, which is evidently responsible for stabilizing the noncubic superconducting phase, in contrast to insulating A 4 C 60.