Structural distortion in superconducting Ba1-xKxBiO3

被引：50
作者：
Braden, M
Reichardt, W
Elkaim, E
Lauriat, JP
Shiryaev, S
Barilo, SN
机构：
[1] Forschungszentrum Karlsruhe, IFP, D-76021 Karlsruhe, Germany
[2] CEA, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France
[3] Univ Paris Sud, LURE, F-91405 Orsay, France
[4] Acad Sci, Inst Phys Solids & Semicond, Minsk 220072, BELARUS
来源：
PHYSICAL REVIEW B | 2000年 / 62卷 / 10期
关键词：
D O I：
10.1103/PhysRevB.62.6708
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structure of superconducting Ba1-xKxBiO3 (BKBO) has been studied by neutron and synchrotron diffraction on single crystalline and on powder samples. In contrast to the phase diagram reported by several groups we find a long range structural distortion persisting in the K-concentration range of superconductivity. The distortion is characterized by a tilt of the BiO6 octahedra around the cubic [001] direction, space group 14/mcm, so far not observed for any BKBO compound. The mixing of light monovalent K atoms with the heavier two-valent Ba atoms causes strong structural disorder, in particular for the octahedron tilt. This disorder is simulated within a harmonic lattice dynamical model.
引用
收藏
页码：6708 / 6715
页数：8
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