Anisotropy of the upper critical field and critical current in single crystal <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">MgB</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

L. Lyard; P. Samuely; P. Szabo; T. Klein; C. Marcenat; L. Paulius; K. H. P. Kim; C. U. Jung; H.-S. Lee; B. Kang; S. Choi; S.-I. Lee; J. Marcus; S. Blanchard; A. G. M. Jansen; U. Welp; G. Karapetrov; W. K. Kwok

doi:10.1103/PhysRevB.66.180502

Rapid Communication

Anisotropy of the upper critical field and critical current in single crystal ${MgB}_{2}$

L. Lyard, P. Samuely, P. Szabo, T. Klein, C. Marcenat, L. Paulius, K. H. P. Kim, C. U. Jung, H.-S. Lee, B. Kang, S. Choi, S.-I. Lee, J. Marcus, S. Blanchard, A. G. M. Jansen, U. Welp, G. Karapetrov, and W. K. Kwok

Phys. Rev. B 66, 180502(R) – Published 27 November 2002

Abstract

We report on specific-heat, high-magnetic-field transport, and ac-susceptibility measurements on ${MgB}_{2}$ single crystals. The upper critical field for magnetic fields perpendicular and parallel to the basal planes is presented in the entire temperature range. A very different temperature dependence has been observed in the two directions, which yields a temperature-dependent anisotropy with $Γ \sim 5$ at low temperatures and $\sim 2$ near $T_{c} .$ A peak effect is observed for $μ_{0} H \sim 2 T$ parallel to the c axis, and the critical current density presents a sharp maximum for H parallel to the $ab$ plane.

Received 13 June 2002

DOI:https://doi.org/10.1103/PhysRevB.66.180502

Authors & Affiliations

L. Lyard^1,2, P. Samuely^3,4, P. Szabo⁴, T. Klein^1,3, C. Marcenat², L. Paulius², K. H. P. Kim⁵, C. U. Jung⁵, H.-S. Lee⁵, B. Kang⁵, S. Choi⁵, S.-I. Lee⁵, J. Marcus¹, S. Blanchard¹, A. G. M. Jansen⁶, U. Welp⁷, G. Karapetrov⁷, and W. K. Kwok⁷

¹Laboratoire d’Etudes des Propriétés Electroniques des Solides, CNRS, Boîte Postale 166, F-38042 Grenoble Cedex 9, France
²Commissariat à l’Energie Atomique-Grenoble, DRFMC-SPSMS, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France
³University Joseph Fourier, Boîte Postale 53, F-38041 Grenoble Cedex 9, France
⁴Institute of Experimental Physics, Slovak Academy of Sciences, SK-04353 Košice, Slovakia
⁵NVCRICS and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
⁶Grenoble High Magnetic Field Laboratory, MPI-CNRS, Boîte Postale 166, F-38042 Grenoble Cedex 9, France
⁷Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

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Vol. 66, Iss. 18 — 1 November 2002

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