Magnetic-field-induced orientation of superconducting MgB2 crystallites determined by x-ray diffraction
Date
2006-08-01
Authors
Li, J.
Vaknin, David
Bud'ko, Sergey L.
Pal, D.
Eskildsen, M. R.
Islam, Z.
Kogan, V. G.
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American Physical Society
Abstract
X-ray diffraction studies of fine polycrystalline samples of MgB2 in the superconducting state reveal that crystals orient with their c axis in a plane normal to the direction of the applied magnetic field. The MgB2 samples were thoroughly ground to obtain average grain size 5-10 mu m in order to increase the population of free single crystal grains in the powder. By monitoring Bragg reflections in a plane normal to an applied magnetic field we find that the powder is textured with significantly stronger (0,0,l) reflections in comparison to (h,k,0), which remain essentially unchanged. The orientation of the crystals with the ab plane parallel to the magnetic field at all temperatures below T-c demonstrates that the sign of the torque under magnetic field does not alter, in disagreement with current theoretical predictions.
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This article is published as Li, J., D. Vaknin, S. L. Bud’ko, P. C. Canfield, D. Pal, M. R. Eskildsen, Z. Islam, and V. G. Kogan. "Magnetic-field-induced orientation of superconducting Mg B 2 crystallites determined by x-ray diffraction." Physical Review B 74, no. 6 (2006): 064502.
DOI: 10.1103/PhysRevB.74.064502.
Copyright 2006 American Physical Society.
Posted with permission.