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Magnetic flux distribution in the bulk of the pure type-II superconductor niobium measured with positive muons |
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| Authors: | D Herlach G Majer J Major J Rosenkranz M Schmolz W Schwarz A Seeger W Templ E H Brandt U Essmann K Fürderer M Gladisch |
| Institution: | 1. Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland 2. Institut für Physik, Max-Planck-Institut für Metallforschung, Postfach 800665, D-7000, Stuttgart 80, Fed. Rep. Germany 3. Institut für Theoretische und Angewandte Physik, Universit?t Stuttgart, Pfaffenwaldring 57, D-7000, Stuttgart 80, Fed. Rep. Germany 4. Physikalisches Institut der Universit?t Heidelberg, Philosophenweg 12, D-6900, Heidelberg 1, Fed. Rep. Germany 5. Max-Planck-Institut für Festk?rperforschung, Heisenbergstrasse 1, D-7000, Stuttgart 80, Fed. Rep. Germany |
| Abstract: | The spin precession of positive muons in ultra-pure Nb single crystals of high perfection, cooled down in transverse magnetic fields 0.68B c2≤B appl≤0.84B c2 (B c2=upper critical field) from temperatures well above the superconducting transition temperatureT c=9.25 K, has been investigated in the temperature range 2.6 K≤T≤8.0 K. The experiments confirm the periodic fieldB(r) of triangular flux-line lattices as calculated from numerical solutions of the microscopic BCS-Gor'kov theory. The observed broadening of the van Hove singularities in the field distribution is discussed in terms of the combined effects of muon diffusion and random perturbations of the flux-line lattice. |
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