Investigation of vortex structures in the intermediate mixed state of MgB2: comparison with Niobium
Recently, vortex clusters have been observed at low magnetic field in MgB2 using magnetic decorations imaging. It was explained as the existence of of new state of superconductivity, called "1.5 superconductivity". However, this has been debated since it is known that the intermediate mixed state observed in more conventional low Tc materials exhibit similar effects. Based on our recent experiments of very small angle neutron scattering in Pure Nb (TPA, LLB, submitted), we propose to measure the low field vortex structures in MgB2, both in single crystals and in dense polycristals as function of magnetic field and temperature. Comparison with detailed scattering data obtained in Nb will allow to clarify the situation and the mechanism of vortex attraction which stabilizes the clusters. It would also provide the first bulk probe of the reportex vortex clusters in MgB2, which were only seen by surface techniques.
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PAUTRAT Alain; BRULET Annie and CUBITT Robert. (2015). Investigation of vortex structures in the intermediate mixed state of MgB2: comparison with Niobium. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-800
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