DEPARTAMENTO MATERIA CONDENSADA

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https://nuclea.cnea.gob.ar/handle/20.500.12553/5228

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Examinando DEPARTAMENTO MATERIA CONDENSADA por Autor "Ale Crivillero, M.V."

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  • Miniatura
    ÍtemAcceso Abierto
    Influence of the Fe Concentration on the Superconducting Properties of Fe1-ySe
    (Springer, 2015-00-00) Amigó, M.L.; Ale Crivillero, M.V.; Franco, D.G.; Guimpel, J.; Nieva, G.; Gerencia Física. Departamento Materia Condensada. División Bajas Temperaturas
    We present a comparative study of electrical transport properties in the normal state and in the dissipative superconducting state between pure β-FeSe phase and Fe deficient Fe1−y Se crystals. We discuss the influence of the intergrowth of the magnetic hexagonal phase (Fe7 Se8 ) in Fe deficient samples when compared to pure β-FeSe samples. In the superconducting state, we measured the ab-plane electrical resistivity with magnetic field up to 16 T and the electrical resistivity as a function of the angle between the c axis and the applied field. The angular dependence at fixed temperature below the superconducting critical temperature, Tc(H = 0), is very different for both sets of crystals. The Fe deficient samples display a vortex pinning-related feature at ∼57◦ off the plane while the pure β-FeSe phase samples show the persistence of a strong angular-dependent magnetoresistance characteristic of the normal state electronic structure.
  • Miniatura
    ÍtemAcceso Abierto
    Intrinsic pinning by naturally occurring correlated defects in FeSe1-xTex superconductors
    (IOP Publishing, 2017-07-12) Amigó, M.L.; Ale Crivillero, M.V.; Franco, D.G.; Badía-Majós, A.; Guimpel, J.; Campo, J.; Damay, F.; Porcher, F.; Condó, A.M.; Nieva, G.; Gerencia Física. Departamento Materia Condensada. División Bajas Temperaturas
    We study the angular dependence of dissipation in the superconducting state of FeSe and Fe(Se1−xTex) through electrical transport measurements, using crystalline intergrown materials. We reveal the key role of the inclusions of the non superconducting magnetic phase Fe1−y(Se1−xTex), growing into the Fe(Se1−xTex) pure β-phase, in the development of a correlated defect structure. The matching of both atomic structures defines the growth habit of the crystalline material as well as the correlated planar defects orientation.