Temperature-Dependent Anisotropy of the Penetration Depth and Coherence Length of MgB2

J. D. Fletcher, A. Carrington, O. J. Taylor, S. M. Kazakov, and J. Karpinski
Phys. Rev. Lett. 95, 097005 – Published 26 August 2005

Abstract

We report measurements of the temperature-dependent anisotropies (γλ and γξ) of both the London penetration depth λ and the upper critical field of MgB2. Data for γλ=λc/λa was obtained from measurements of λa and λc on a single crystal sample using a tunnel diode oscillator technique. γξ=Hc2c/Hc2c was deduced from field-dependent specific heat measurements on the same sample. γλ and γξ have opposite temperature dependencies, but close to Tc tend to a common value (γλγξ=1.75±0.05). These results are in good agreement with theories accounting for the two-gap nature of MgB2.

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  • Received 19 January 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.097005

©2005 American Physical Society

Authors & Affiliations

J. D. Fletcher, A. Carrington, and O. J. Taylor

  • H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL, United Kingdom

S. M. Kazakov and J. Karpinski

  • Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland

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Issue

Vol. 95, Iss. 9 — 26 August 2005

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