Multiband character of $\beta$-FeSe: Angular dependence of the magnetoresistance and upper critical field

Abstract

We studied $ab$-plane transport properties in single crystals of the superconductor $\beta$-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 (T${}_c$=8.87(5) K) the upper critical field anisotropy $H$${}_{c2}$$\parallel$$ab$ / $H$${}_{c2}$$\parallel$$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.

arXiv comment5 pages, 4 figures, 27th International Conference on Low Temperature Physics (LT27)

References in corpus (9)

• Superconductivity in Iron Compounds
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
• Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
• Unusual band renormalization in the simplest iron based superconductor
• Pauli-limited upper critical field in Fe1+yTe1-xSex
• Evolution of two-gap behavior of the superconductor FeSe_1-x
• Multiband effects on beta-FeSe single crystals

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• Microstructural control of the transport properties of $\beta$-FeSe films grown by sputtering
• Robustness of superconductivity to structural disorder in Sr${}_{0.3}$(NH${}_2$)${}_y$(NH${}_3$)${}_{1-y}$Fe${}_2$Se${}_2$
• Vortex dynamics in $\beta$-FeSe single crystals: effects of proton irradiation and small inhomogeneous stress
• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals
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