Multiband character of β-FeSe: Angular dependence of the magnetoresistance and upper critical field

27th International Conference on Low Temperature Physics

Amigó, M.L.^1 ; Crivillero, V. Ale^1 ; Franco, D.G.^1 ; Nieva, G.^1,2

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

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

关键词: Angular dependence;    Anisotropic behaviors;    Fixed temperature;    Normal state;    Positive magnetoresistance;    Superconducting state;    Two-band model;    Upper critical fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022005/pdf
DOI  :  10.1088/1742-6596/568/2/022005

来源: IOP

【 摘 要 】

We studied ab-plane transport properties in single crystals of The superconductor β-FeSe up to 16 T. In The normal state, below 90 K, The crystals present a strongly anisotropic positive magnetoresistance that becomes negligible above that temperature. In The superconducting state (Tc=8.87(5) K) The upper critical field anisotropy Hc2||ab/Hc2||c changes with temperature and The angular dependence of The dissipation for fixed temperatures and fields reflects a strongly anisotropic behavior. Our results make evident that multiband effects are needed to describe The measured transport properties. We model The magnetoresistance and upper critical field behavior with a two-band model showing that The diffusivities ratio parameter remains unchanged going from The normal to The superconducting state.