Vortex pinning by intrinsic correlated defects in Fe1?ySe

11th European Conference on Applied Superconductivity

Amigó, M.L.^1 ; Crivillero, V Ale^1 ; Franco, D.G.^1 ; Badía-Majós, A.^3,4 ; Guimpel, J.^1,2 ; Nieva, G.^1,2

Comisión Nacional de Energía Atómica-Centro Atómico Bariloche, Instituto Balseiro, Universidad Nacional de Cuyo, S.C. de Bariloche, Argentina^1

CICyT-Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina^2

Universidad de Zaragoza, Spain^3

Instituto de Ciencia de Materiales de Aragón, CSIC, Spain^4

关键词: Angular dependence;    Anisotropic crystals;    Electronic anisotropy;    Field directions;    In-plane electrical resistivity;    Superconducting state;    Transport and magnetic properties;    Vortex dynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/1/012001/pdf
DOI  :  10.1088/1742-6596/507/1/012001

来源: IOP

【 摘 要 】

We present a study on the transport and magnetic properties of superconducting Fe1-ySe single crystals. In the superconducting state, the in-plane electrical resistivity of the crystal is measured for fields up to 16 T and as a function of field direction, in order to understand how the vortex dynamics is affected by the presence of defects. A strong deviation from the slightly anisotropic crystal (electronic anisotropy constant 7 ∼ 1.08) is observed as a steep angular dependence, which is interpreted as a signature of the presence of correlated defects. The influence of the correlated defects on the critical current is studied through the angular dependence of the magnetization, and compared to numerical simulations.