Magnetotransport and the upper critical magnetic field in MgB2

Szabó, P.; Samuely, P.; Jansen, A. G. M.; Klein, T.; Marcus, J.; Fruchart, D.; Miraglia, S.

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Magnetotransport and the upper critical magnetic field in MgB₂

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Samuely, P.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen, A. G. M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Szabó, P., Samuely, P., Jansen, A. G. M., Klein, T., Marcus, J., Fruchart, D., et al. (2002). Magnetotransport and the upper critical magnetic field in MgB₂. Physica C, 369(1-4), 250-253.

Cite as: https://hdl.handle.net/21.11116/0000-000E-EE9D-6

Abstract

Magnetotransport measurements are presented on polycrystalline
MgB2 samples, The 'resistive' upper critical magnetic field
reveals a temperature dependence with a positive curvature from
T-c = 39.3 K down to about 20 K, then changes to a slightly
negative curvature reaching 25 T at 1.5 K. The 25-T upper
critical field is much higher than what is known so far on
polycrystals of MgB2 but it is in agreement with recent data
obtained on epitaxial MgB2 films. The deviation of B-c2 (T)
from standard BCS might be due to the proposed two-gap
superconductivity in this compound. The observed quadratic
normal-state magnetoresistance with validity of Kohler's rule
can be ascribed to classical trajectory effects in the low-
field limit. (C) 2001 Elsevier Science B.V. All rights
reserved.