SANS to measure superfluid density in chalcogenure and selenure: a comparative study to clarify peculiarities of iron based superconductor
The binary superconductor FeSe has a relatively structural simplicity among other Fe-based superconductors and is though to be a model system to study the mechanism of superconductivity in iron based pnictides and chalcogenides. The study of its flux lines lattice, and of the fundamental parameter of superconductivity, using a bulk probe as small angle neutron scattering is mandatory. Unfortunatly, it is very difficult to growth large enough and pure FeSe single crystals. Recently, crystals with reasonable mass have been available within our collaboration, and , using a high flux spectrometer, the experiment appears faisable. We plan to measure scattered intensity from the flux lines in the low field limit to reveal multiband and/or nodes effects in this important member of the superconducting family. In this experiment, we will also use a large NbSe2 crystal as a reference for a multiband, anisotropic SC but with a conventional pairing mechanism. Study of flux lines lattice at higher field (i.e. some Teslas) will be also conducted to reveal transition or disordering in the flux lines lattice, that may have important consequences on the transport and magnetic properties.
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PAUTRAT Alain; AMIGO María Lourdes; CUBITT Robert; FASANO Yanina; RODIERE Pierre and VAN DER BEEK Cornelis. (2015). SANS to measure superfluid density in chalcogenure and selenure: a comparative study to clarify peculiarities of iron based superconductor. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-407
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