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Phys. Rev. B 70, 224513 (2004) [5 pages]

Anisotropy and internal-field distribution of MgB2 in the mixed state at low temperatures

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M. Angst1,2,*, D. Di Castro1, D. G. Eshchenko1,3, R. Khasanov3,4,1, S. Kohout1, I. M. Savic5, A. Shengelaya1, S. L. Bud’ko2, P. C. Canfield2, J. Jun6, J. Karpinski6, S. M. Kazakov6, R. A. Ribeiro2,†, and H. Keller1
1Physik-Institut der Universität Zürich, CH-8057 Zürich, Switzerland
2Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
3Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
4DPMC, Université de Genève, 24 Quai Ernest-Ansermet, CH-1211 Genève, Switzerland
5Faculty of Physics, University of Belgrade, 11001 Belgrade, Yugoslavia
6Solid State Physics Laboratory, ETH, CH-8093 Zürich, Switzerland

Received 20 May 2004; published 14 December 2004

Magnetization and muon spin relaxation on MgB2 were measured as a function of the applied magnetic field at 2 K. Both indicate an inverse-squared penetration depth strongly decreasing with increasing field H below about 1 T. Magnetization also suggests the anisotropy of the penetration depth increases with increasing H, interpolating between a low Hc1 and a high Hc2 anisotropy. Measurements of the torque as a function of the angle between the field and the c axis of the crystal are in agreement with this finding, while also ruling out drastic differences between the mixed state anisotropies of the two basic length scales penetration depth and coherence length.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.224513
DOI:
10.1103/PhysRevB.70.224513
PACS:
74.25.Op, 74.20.De, 74.25.Ha, 74.70.Ad

*Email address: angst@ameslab.gov

†Present address: Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan.

 
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