Measuring the Penetration Depth Anisotropy in MgB$_2$ using Small-Angle   Neutron Scattering

D. Pal; L. DeBeer-Schmitt; T. Bera; R. Cubitt; C. D. Dewhurst; J. Jun,; N. D. Zhigadlo; J. Karpinski; V. G. Kogan; M. R. Eskildsen

arXiv:cond-mat/0511376·cond-mat.supr-con·November 11, 2009

Measuring the Penetration Depth Anisotropy in MgB$_2$ using Small-Angle Neutron Scattering

D. Pal, L. DeBeer-Schmitt, T. Bera, R. Cubitt, C. D. Dewhurst, J. Jun,, N. D. Zhigadlo, J. Karpinski, V. G. Kogan, M. R. Eskildsen

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Abstract

Using small-angle neutron scattering we have measured the misalignment between an applied field of 4 kOe and the flux-line lattice in MgB $_{2}$ , 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, $\glam = 1.1 \pm 0.1$ .

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