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

页码：6708 / 6715

页数：8

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