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Geometrical barriers and lower critical field in MgB2 single crystals

L. Lyard, T. Klein, J. Marcus, R. Brusetti, C. Marcenat, M. Konczykowski, V. Mosser, K. H. Kim, B. W. Kang, H. S. Lee, and S. I. Lee
Phys. Rev. B 70, 180504(R) – Published 30 November 2004
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Abstract

The first penetration field (Hp) has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For Ha‖c, 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±0.01T).

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  • Received 6 August 2004

DOI:https://doi.org/10.1103/PhysRevB.70.180504

©2004 American Physical Society

Authors & Affiliations

L. Lyard1, T. Klein1,2, J. Marcus1, R. Brusetti3, C. Marcenat4, M. Konczykowski5, V. Mosser6, K. H. Kim7, B. W. Kang7, H. S. Lee7, and S. I. Lee7

  • 1Laboratoire d’Etudes des Propriétés Electroniques des Solides, CNRS, Boîte Postale 166, 38042 Grenoble Cedex 9, France
  • 2Institut Universitaire de France and Université Joseph Fourier, Boîte Postale 53, 38041 Grenoble Cedex 9, France
  • 3Centre de Recherche sur les Très Basses Températures, Centre National de la Recherche Scientifique, Boîte Postale 166, 38042 Grenoble Cedex 9, France
  • 4Département de Recherche Fondamentale sur la Matière Condensée, Commissariat à l’Energie Atomique - Grenoble, SPSMS, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
  • 5Laboratoire des Solides Irradiés, Ecole Polytechnique, 91128 Palaiseau, France
  • 6Schlumberger Utilities Technology Group, 50 avenue Jean Jaures, Boîte Postale 620-13, F-92542 Montrouge, France
  • 7NVCRICS and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

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Vol. 70, Iss. 18 — 1 November 2004

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