Effect of strain on the critical current and critical field of B1 structure NbN superconductors
- 15 November 1982
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 41 (10) , 996-998
- https://doi.org/10.1063/1.93369
Abstract
The effect of uniaxial strain on the critical current of NbN superconductors has been measured at 4.2 K in magnetic fields from 6 to 22 T. Unlike A15 superconductors, the critical current of B1 structure NbN shows no measurable dependence on elastic strain, even at fields as high as 22 T. Furthermore, the bulk upper critical field determined from the high-field critical current data is independent of uniaxial strain within experimental error (±0.5%). The irreversible strain limit εirrev where the superconductor is permanently damaged was measured to be greater than 0.7% (0.5% intrinsic strain) in 0.2-μm-thick film samples. Values of εirrev were observed to correlate with the microstructure of the NbN films as well as with the onset of substrate yielding.Keywords
This publication has 7 references indexed in Scilit:
- Dimensional effects on current and field properties in NbN filmsIEEE Transactions on Magnetics, 1981
- Strain scaling law for flux pinning in NbTi, Nb3Sn, Nb-Hf/Cu-Sn-Ga, V3Ga and Nb3GeIEEE Transactions on Magnetics, 1981
- Strain scaling law for flux pinning in practical superconductors. Part 1: Basic relationship and application to Nb3Sn conductorsCryogenics, 1980
- Strain dependence of the critical current and critical field in multifilamentary Nb3Sn compositesIEEE Transactions on Magnetics, 1979
- Effect of stress on the critical current of Nb3Sn multifilamentary composite wireApplied Physics Letters, 1976
- Electronmicroscopic evidence for a columnar-void-type structure in sputtered NbN filmsJournal of Applied Physics, 1974
- Very High Critical Current and Field Characteristics of Niobium Nitride Thin FilmsJournal of Applied Physics, 1971