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Phys. Rev. B 73, 012513 (2006) [4 pages]

Measuring the penetration depth anisotropy in MgB2 using small-angle neutron scattering

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D. Pal1, L. DeBeer-Schmitt1, T. Bera1, R. Cubitt2, C. D. Dewhurst2, J. Jun3, N. D. Zhigadlo3, J. Karpinski3, V. G. Kogan4, and M. R. Eskildsen1,*
1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
2Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France
3Laboratory for Solid State Physics, ETH, CH-8093 Zürich, Switzerland
4Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 8 October 2005; published 26 January 2006

Using small-angle neutron scattering, we have measured the misalignment between an applied field of 4 kOe and the flux-line lattice in MgB2, as the field is rotated away from the c axis by an angle θ. The measurements, performed at 4.9 K, showed the vortices canting towards the c axis for all field orientations. Using a two-band/two-gap model to calculate the magnetization, we are able to fit our results yielding a penetration depth anisotropy, γλ=1.1±0.1.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.73.012513
DOI:
10.1103/PhysRevB.73.012513
PACS:
74.25.Qt, 74.70.Ad, 61.12.Ex, 74.20.−z

*Electronic address: eskildsen@nd.edu

 
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