Two-band effects in the angular dependence of Hc2 of MgB2 single crystals

A. Rydh, U. Welp, A. E. Koshelev, W. K. Kwok, G. W. Crabtree, R. Brusetti, L. Lyard, T. Klein, C. Marcenat, B. Kang, K. H. Kim, K. H. P. Kim, H.-S. Lee, and S.-I. Lee
Phys. Rev. B 70, 132503 – Published 28 October 2004
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Abstract

The angular dependence of the upper critical field Hc2 of MgB2 single crystals is studied at various temperatures by means of specific-heat and transport measurements in magnetic fields up to 17T. Clear deviations from Ginzburg–Landau behavior are observed at all temperatures and are explained by two-band effects. The angular dependence and temperature dependence of the deviations are in qualitative agreement with theoretical predictions based on band-structure calculations. Quantitative agreement is obtained with an interband coupling slightly stronger than the calculated one, enabling band-structure anisotropies and interband coupling strength to be experimentally estimated. This provides a pathway to the study of disorder and doping effects in MgB2.

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  • Received 29 July 2003
  • Publisher error corrected 16 December 2004

DOI:https://doi.org/10.1103/PhysRevB.70.132503

©2004 American Physical Society

Corrections

16 December 2004

Erratum

Publisher's Note: Two-band effects in the angular dependence of Hc2 of MgB2 single crystals [Phys. Rev. B 70, 132503 (2004)]

A. Rydh, U. Welp, A. E. Koshelev, W. K. Kwok, G. W. Crabtree, R. Brusetti, L. Lyard, T. Klein, C. Marcenat, B. Kang, K. H. Kim, K. H. P. Kim, H.-S. Lee, and S.-I. Lee
Phys. Rev. B 70, 219905 (2004)

Authors & Affiliations

A. Rydh*, U. Welp, A. E. Koshelev, W. K. Kwok, and G. W. Crabtree

  • Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

R. Brusetti, L. Lyard, and T. Klein

  • Laboratoire d’Etudes des Propriétés Electroniques des Solides, CNRS, Boîte Postale 166, 38042 Grenoble, France

C. Marcenat

  • Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, CEA-Grenoble, 38054 Grenoble, France

B. Kang, K. H. Kim, K. H. P. Kim, H.-S. Lee, and S.-I. Lee

  • NCRICS and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

  • *Electronic address: rydh@anl.gov

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Vol. 70, Iss. 13 — 1 October 2004

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