| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Abrahamsen, Asger Bech
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2023Corrosion surface morphology-based methodology for fatigue assessment of offshore welded structurescitations
- 2018Two level undercut-profile substrate-based filamentary coated conductors produced using metal organic chemical vapor depositioncitations
- 2018Optimal design of galvanic corrosion protection systems for offshore wind turbine support structurescitations
- 2017Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbinescitations
- 2017The Effect of Nano-TiC Addition on Sintered Nd-Fe-B Permanent Magnetscitations
- 2017The Effect of Nano-TiC Addition on Sintered Nd-Fe-B Permanent Magnetscitations
- 2017Topology Comparison of Superconducting Generators for 10-MW Direct-Drive Wind Turbines: Cost of Energy Basedcitations
- 2015Potential of MgB 2 superconductors in direct drive generators for wind turbines
- 2015Effects of an electromagnetic shield and armature teeth on the short-circuit performance of a direct drive superconducting generator for 10 MW wind turbinescitations
- 2015Potential of MgB2 superconductors in direct drive generators for wind turbines
- 2012Large superconducting wind turbine generatorscitations
- 2012Critical current density measurement of thin films by AC susceptibility based on the penetration parameter hcitations
- 2010Influence of the initial Bi2223 phase content on microstructure development in Bi2223/Ag tapescitations
- 2010Anisotropy of the critical current in MgB2 tapes made of high energy milled precursor powdercitations
- 2009Modeling flux pinning in thin undoped and BazRo3-doped YBCO filmscitations
- 2009Design study of 10 kW superconducting generator for wind turbine applicationscitations
- 2009Design study of 10 kW superconducting generator for wind turbine applicationscitations
- 2003Possible magnetism in vortex cores of superconducting TmNi2B2C studied by small angle neutron scattering
- 2003Possible magnetism in vortex cores of superconducting TmNi 2 B 2 C studied by small angle neutron scattering
Places of action
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thesis
Possible magnetism in vortex cores of superconducting TmNi2B2C studied by small angle neutron scattering
Abstract
The borocarbide intermetallics RNi<sub>2</sub>B<sub>2</sub>C (R = Y, Ce-Lu) were discovered in 1994 and attracted a large attention because superconductivity and magnetic ordering are coexisting in R = Dy, Ho, Er and Tm. Early reports concluded that these compounds should be considered as anisotropic BCS superconductors with a phonon-mediated moderately strong coupling between the conduction electrons causing the creation of Cooper pairs. The magnetism is of the indirect Ruderman-Kittel-Kasuya-Yosida(RKKY) type where the conduction electrons are polarized by the local magnetic moment of the rare-earth ions and thereby mediates a coupling between the ions, which orders into a spin density wave at sufficiently low temperatures. Thus an intricate interplay between the magnetism and the superconducting state is expected and has indeed been observed. The compound TmNi<sub>2</sub>B<sub>2</sub>C has previously been studied by Small Angle Neutron Scattering(SANS) with the applied field along the crystalline c-axis and a very rich phase diagram in terms of flux line lattices(FLL) with different symmetries have been found. One of the FLL transitions is coincident with a magnetic phase transition between two spin density waves. In this thesis additional SANS studies of the FLL phases in TmNi<sub>2</sub>B<sub>2</sub>C are reported and an interpretation of the phase diagram in the paramagnetic region is presented. It is suggested that the observed square FLL is stable in between two transition lines determined by two different length scales. The lower transition field is reached when the distance between the flux lines becomes comparable to the non-locality radius resulting from non-local electrodynamics, whereas the upper transition field is determined from the crossover from intermediate to high flux line density where the vortex cores start to overlap and the superconducting order parameter is suppressed in between the flux lines. A detailed examination of the intensity of the neutron diffraction spots caused by scattering on the flux line lattice in TmNi<sub>2</sub>B<sub>2</sub>C is presented and analyzed on the basis of the form factor of an isolated flux line. This analysis can not provide a good explanation for the observed scattering and it is suggested that the scattering from the Tm ions must be considered. One can argue that the moments of the Tm ions are modulated by the flux line lattice, because the RKKY interaction between the Tm ions might be different inside the vortex cores than outside in the superconducting phase. A calculation of the neutron scattering cross section of such a magnetic flux line lattice has been performed and compared to the SANS data. This offers a qualitative explanation of some of the observations, but future work is needed to make a more quantitative comparison.