Relations between superconductivity and structure obtained by neutron diffraction
Abstract
In this paper we will discuss the influence of structure on the superconductivity and Tc of oxides, from the 'low Tc' materials such as Ba(Pb, Bi)O3, (Ba, K)BiO3 and Ba(Pb, Sb)O3 through the CuO-layer materials such as "123", "124", "127" etc. to the (Bi, Pb, Tl)-oxide layer materials. Neutron diffraction is a unique method of studying the oxygen structure in these heavy metal oxides, especially at low temperature and high pressure. We will see that superconductivity depends strongly on oxygen content and cation doping, but also on the details of the Cu-O co-ordination and bond lengths. These neutron results have lead to the concept of Tc being controlled by charge transfer between "charge reservoir" layers and conducting CuO-planes.
- Publication:
-
Physica Scripta
- Pub Date:
- July 1991
- DOI:
- 10.1088/0031-8949/44/1/004
- Bibcode:
- 1991PhyS...44...38H
- Keywords:
-
- Crystal Structure;
- High Temperature Superconductors;
- Neutron Diffraction;
- Superconductivity;
- Copper Oxides;
- Pressure Dependence;
- Temperature Dependence;
- Solid-State Physics