Effects of magnetic and non-magnetic doping on the vortex lattice in MgB2
Date
2022
Authors
Louden, E. R.
Manni, S.
Van Zandt, J. E.
Leishman, A. W. D.
Taufour, V.
Bud'ko, Sergey L.
DeBeer-Schmitt, L.
Honecker, D.
Dewhurst, C. D.
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arXiv
Abstract
Using small-angle neutron scattering we have studied the vortex lattice in superconducting MgB2 with the magnetic field applied along the c-axis, doped with either manganese or carbon to achieve a similar suppression of the critical temperature. For Mn-doping, the vortex lattice phase diagram remains qualitatively similar to that of pure MgB2, undergoing a field-and temperature-driven 30∘ rotation transition, indicating only a modest effect on the vortex-vortex interaction. In contrast, the vortex lattice rotation transition is completely suppressed in the C-doped case, likely due to a change in the electronic structure which affects the two-band/two-gap nature of superconductivity in MgB2. The vortex lattice longitudinal correlation length shows the opposite behavior, remaining roughly unchanged between pure and C-doped MgB2 while it is significantly reduced in the Mn-doped case. However, the extensive vortex lattice metastability and related activated behavior, observed in conjunction with the vortex lattice transition in pure MgB2, is also seen in the Mn doped sample. This shows that the vortex lattice disordering is not associated with a substantially increased vortex pinning.
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Preprint
Comments
This is a pre-print of the article Louden, E. R., S. Manni, J. E. Van Zandt, A. W. D. Leishman, V. Taufour, S. L. Bud'ko, L. DeBeer-Schmitt et al. "Effects of magnetic and non-magnetic doping on the vortex lattice in MgB2." arXiv preprint arXiv:2202.10490 (2022).
DOI: 10.48550/arXiv.2202.10490
Attribution 4.0 International (CC BY 4.0).
Copyright 2022 The Authors.
Posted with permission.