Evidence of Cooper pair diffraction on the vortex lattice of superconducting niobium

  title={Evidence of Cooper pair diffraction on the vortex lattice of superconducting niobium},
  author={Alexander Maisuradze and Alain Le Yaouanc and Rustem Khasanov and Alex Amato and Christopher Baines and Dieter M Herlach and Rudolf Henes and P. Keppler and Hugo Keller},
  journal={Physical Review B},
We investigated the Abrikosov vortex lattice (VL) of a pure Niobium single crystal with the muon spin rotation (\mu SR) technique. Analysis of the \mu SR data in the framework of the BCS-Gor'kov theory allowed us to determine microscopic parameters and the limitations of the theory. With decreasing temperature the field variation around the vortex cores deviates substantially from the predictions of the Ginzburg-Landau theory and adopts a pronounced conical shape. This is evidence of partial… 
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