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

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...

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Bibliographic Details
Main Authors: Amigó, M L, Crivillero, V Ale, Franco, D G, Nieva, G
Format: Conference Proceeding
Language:English
Subjects:
Anisotropy
Critical field (superconductivity)
Magnetic properties
Magnetoresistance
Magnetoresistivity
Physics
Single crystals
Superconductivity
Temperature dependence
Transport properties
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/568/2/022005