Intrinsic magnetic properties of NdFeAsO$_{0.9}$F$_{0.1}$ superconductor from local and global measurements

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dc.creatorProzorov, R.
dc.creatorTillman, M. E.
dc.creatorMun, E. D.
dc.creatorCanfield, P. C.
dc.date2008-05-19
dc.date2008-06-04
dc.date.accessioned2026-07-07T12:56:38Z
dc.date.available2026-07-07T12:56:38Z
dc.descriptionMagneto-optical imaging was used to study the local magnetization in polycrystalline NdFeAsO$_{0.9}$F$_{0.1}$ (NFAOF). Individual crystallites up to $\sim200\times100\times30$ $μm^{3}$ in size could be mapped at various temperatures. The in-grain, persistent current density is about $j\sim10^{5}$ A/cm$^{2}$ and the magnetic relaxation rate in a remanent state peaks at about $T_{m}\sim38$ K. By comparison with with the total magnetization measured in a bar-shaped, dense, polycrystalline sample, we suggest that NdFeAsO$_{0.9}$F$_{0.1}$ is similar to a layered high-$T_{c}$, compound such as Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+x}$ and exhibits a $3D\to2D$ crossover in the vortex structure. The 2D Ginzburg parameter is about $Gi^{2D}% \simeq10^{-2}$ implying electromagnetic anisotropy as large as $ε\sim1/30$. Below $T_{m}$, the static and dynamic behaviors are consistent with collective pinning and creep.
dc.identifierhttps://arxiv.org/abs/0805.2783
dc.identifierhttp://arxiv.org/abs/0805.2783
dc.identifierNew Journal of Physics 11, 035004 (2009) - FOCUS issue
dc.identifierdoi:10.1088/1367-2630/11/3/035004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224648
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleIntrinsic magnetic properties of NdFeAsO$_{0.9}$F$_{0.1}$ superconductor from local and global measurements
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