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

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

2005-11-15

arxiv.org/abs/cond-mat/0511376v3

Phys. Rev. B 73, 012513 (2006)

Physics

Condensed Matter

Superconductivity

4figures

Scientific paper

10.1103/PhysRevB.73.012513

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 $\theta$. 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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