Vortex pinning by intrinsic correlated defects in Fe_1-y Se_x Te_1-x

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

Génova

Congreso; 11° European conference on applied superconductivity; 2013

We present a study on the transport and magnetic properties of superconducting Fe_1-ySe_xTe_1-x single crystals. Both the Fe and Se contents are important to determine the superconducting and normal state properties [1]. In the superconducting state, we study the in-plane resistivity for fields up to 16T. We measure the resistivity as a function of the angle between the crystal plane and the applied field. This gives information on how the vortex dynamics is affected by the presence of defects. For Fe_1-ySe, we also study the influence of the correlated defects on the magnetization critical current and compare with numerical simulations. The angular dependences indicate that the nature of the correlated defects could originate on the interfaces between tetragonal and hexagonal phases at the intergrowths.