H Hilgenkamp et al 1999 Supercond. Sci. Technol. 12 1043 doi:10.1088/0953-2048/12/12/301
Grain boundary critical currents - a new perspective
H Hilgenkamp, C W Schneider, B Goetz, R R Schulz, A Schmehl, H Bielefeldt and J Mannhart
Show affiliationsMore than a decade of research on grain boundaries in high-Tc superconductors has brought extensive knowledge about their often peculiar electronic properties. However, a comprehensive understanding of the physical principles underlying these properties is still in development. The universal character of the grain boundary transport properties for many different high-Tc compounds suggests that these are to a large extent controlled by generic aspects of the cuprate materials, such as the grain boundary microstructure, the predominant dx2-y2 symmetry of the order parameter and the possibility of bending of the electronic band structure, leading to the formation of space-charge layers. The latter offers a new perspective to improve grain boundary interfaces, e.g. by appropriately doping the material. This is demonstrated by the example of Ca doping of YBa2Cu3O7-
, a procedure with which the grain boundary Jc has been strongly enhanced.
- PACS
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74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
- Subjects
- Dates
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Issue 12 (December 1999)
Received 7 July 1999
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Grain boundary critical currents - a new perspective
H Hilgenkamp et al 1999 Supercond. Sci. Technol. 12 1043
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