Abstract

AbstractNeutron diffraction experiments on flux line lattices in superconducting Nb and NbTa are reported. From experimental data (form factors, lattice parameters, rocking curves etc.) following results are obtained. The microscopic flux distribution of a single flux line in NbTa could be determined. For Nb the form factors are compared with a theory valid in the vicinity of Hc2 A correlation between the flux line lattice and the crystal lattice has been found. Finally the attractive interaction between neighbouring flux lines in Nb has been verified and the resulting maximum lattice parameter compared with the corresponding distance in recent nonlocal calculations.

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