Influence of Intrinsic Correlated Defects in the Critical Currents of Superconductor Fe1-YSe

M. V. ALE CRIVILLERO; M. L. AMIGÓ; D. G. FRANCO; J. GUIMPEL; A. BADÍA MAJÓS; G. NIEVA

Buenos Aires

Conferencia; 27th International Conference on Low Temperature Physics; 2014

We present a study of the anisotropy of the vortex dynamics in the iron based superconductor Fe1-ySe. A series of longitudinal and transverse magnetization measurements were performed rotating the sample for fixed temperature and magnetic field. We also performed X-rays and electrical transport measurements. The crystals present a coexistence between a superconducting phase and a magnetic phase. The crystalline match between these phases introduces correlated defects that could be relevant to the movement of the vortices. Two magnetization experiments were performed. In the first one, the magnetization is measured as a function of the angle between the magnetic field and the normal of the crystal plane. The results show modulations that can be understood considering a particular match between these phases. These results were compared with simulations based on the critical state theory. A critical current density with anisotropic behavior in agreement with experiments of angular dependence of the resistivity was used in this simulation. In the second experiment, a series of magnetization loops was measured for different orientations of the magnetic field from the basal plane of the crystal. This allowed us to find the angular dependence of the critical current.