Probing multi-band superconductivity and magnetism in SmFeAsO$_{0.8}$F$_{0.2}$ single crystals by high-field vortex torque magnetometry

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dc.creatorBalicas, L.
dc.creatorGurevich, A.
dc.creatorJo, Y. J.
dc.creatorJaroszynski, J.
dc.creatorLarbalestier, D. C.
dc.creatorLiu, R. H.
dc.creatorChen, H.
dc.creatorChen, X. H.
dc.creatorZhigadlo, N. D.
dc.creatorKatrych, S.
dc.creatorBukowski, Z.
dc.creatorKarpinski, J.
dc.date2008-09-24
dc.date2009-01-14
dc.date.accessioned2026-07-07T12:28:46Z
dc.date.available2026-07-07T12:28:46Z
dc.descriptionTo probe manifestations of multiband superconductivity in oxypnictides, we measured the angular dependence of magnetic torque $τ(θ)$ in the mixed state of SmO$_{0.8}$F$_{0.2}$FeAs single crystals as functions of temperature $T$ and high magnetic field $H$ up to 30 T. We show that the effective mass anisotropy parameter $γ$ extracted from $τ(θ)$, can be greatly overestimated if the strong paramagnetism of Sm or Fe ions is not properly taken into account. The correctly extracted $γ$ depends on both $T$ and $H$, saturating at $γ\simeq 9$ at lower temperatures. Neither the London penetration depth nor the superfluid density is affected by high fields fields up to the upper critical field. Our results indicate two strongly-coupled superconducting gaps of nearly equal magnitudes.
dc.description5 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0809.4223
dc.identifierhttp://arxiv.org/abs/0809.4223
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215649
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleProbing multi-band superconductivity and magnetism in SmFeAsO$_{0.8}$F$_{0.2}$ single crystals by high-field vortex torque magnetometry
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