Magnetic-field-induced orientation of superconducting MgB2 crystallites determined by x-ray diffraction
J. Li, D. Vaknin, S. L. Bud’ko, P. C. Canfield, D. Pal, M. R. Eskildsen, Z. Islam, V. G. Kogan
DOI 10.1103/PhysRevB.74.064502 · Physical Review B
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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 5–10μm 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 Tc demonstrates that the sign of the torque under magnetic field does not alter, in disagreement with current theoretical predictions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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