Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2004

Geometrical barriers and lower critical field in MgB2 single crystals

Résumé

The first penetration field sHpd has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For Ha ic, the geometrical barriers (GB) play a dominant role in the irreversibility mechanism. In thin samples, neglecting the GB in this direction would then lead to a large overestimation of Hc1 deduced from Hp through the standard elliptical formula. The lower critical field is found to be isotropic at low temperature (0.11±0.01 T).

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hal-00957726 , version 1 (11-03-2014)

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L. Lyard, Thierry Klein, J. Marcus, R. Brusetti, C. Marcenat, et al.. Geometrical barriers and lower critical field in MgB2 single crystals. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 70, pp.180504(R). ⟨10.1103/PhysRevB.70.180504⟩. ⟨hal-00957726⟩
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