Structural and electronic properties of the noncubic superconducting fullerides A′4C60 (A′= Ba, Sr)

被引：39

作者：

Brown, CM ^{[1
]}

Taga, S

Gogia, B

Kordatos, K

Margadonna, S

Prassides, K

Iwasa, Y

Tanigaki, K

Fitch, AN

Pattison, P

机构：

[1] Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[3] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan

[4] Natl Inst Mat & Chem Technol, Dept Adv Chem Technol, Tsukuba, Ibaraki 3058565, Japan

[5] Osaka City Univ, Fac Sci, Sumiyoshi Ku, Osaka, Japan

[6] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[7] Univ Lausanne, Inst Crystallog, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.83.2258

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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(1u)-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-epsilon F. Close contacts between Ba2+ ions and neighboring C-60 units in Ba4C60 imply a strong orbital hybridization, which is evidently responsible for stabilizing the noncubic superconducting phase, in contrast to insulating A(4)C(60).

引用

页码：2258 / 2261

页数：4

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