Magnetism and superconductivity in the FeRESr2Cu2Oy system
The so-called MT-1212 phases resulting from copper substitution in the YBCO model compound by other transition metals allows to study the effect of the charge reservoir block structure in the superconducting properties. We have recently observed an unexpected functionality in the Mo-1212 system: a dependence of the Cu(2)/MT(2)-O(3) distance (CuOap) with the Tc contrary to the usual trend and a mutual red-ox process between the transition metal cations (Cu and Mo). Here we address this problem in the analogue Fe-1212 system. This FeSr2RECu2Oy system undergoes a structural evolution between Ima2 and P4/mmm space groups after subsequent reducing/oxidizating treatments, which are accompanied by a progressive change in the magnetic/superconducting properties. The aim of this proposal is a detailed structural description of the iron environment evolution, in connection with the associated magnetic structure, throughout the phase transformation. The neutron diffraction study is to be complemented with an electronic description by means of X-Ray absorption spectroscopy and electron energy loss spectroscopy -EELS- (in progress).
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LOPEZ PAZ Sara Almudena; MARTINEZ DE IRUJO LABALDE Xabier; E. MORAN and RITTER Clemens. (2018). Magnetism and superconductivity in the FeRESr2Cu2Oy system. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-705
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