Doping-Driven Collapse of the SDW Correlation Gap in SmFeAsO$_{1-x}$F$_{x}$

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dc.creatorRiggs, Scott C.
dc.creatorMcDonald, R. D.
dc.creatorKemper, J. B.
dc.creatorStegen, Z.
dc.creatorBoebinger, G. S.
dc.creatorBalakirev, F. F.
dc.creatorKohama, Y.
dc.creatorMigliori, A.
dc.creatorChen, H.
dc.creatorLiu, R. H.
dc.creatorChen, X. H.
dc.date2008-09-16
dc.date2008-09-22
dc.date.accessioned2026-07-07T10:04:14Z
dc.date.available2026-07-07T10:04:14Z
dc.descriptionWe report the Hall resistivity, $ρ_{xy}$ of polycrystalline SmFeAsO$_{1-x}$F$_{x}$ for four different fluorine concentrations from the onset of superconductivity through the collapse of the structural phase transition. For the two more highly-doped samples, $ρ_{xy}$ is linear in magnetic field up to 50 T with only weak temperature dependence, reminiscent of a simple Fermi liquid. For the lightly-doped samples with $x<0.15$, we find a low temperature regime characterized $ρ_{xy}(H)$ being both non-linear in magnetic field and strongly temperature dependent even though the Hall angle is small. The onset temperature for this non-linear regime is in the vicinity of the structural phase (SPT)/spin density wave (SDW) transitions. The temperature dependence of the Hall resistivity is consistent with a thermal activation of carriers across an energy gap. The evolution of the energy gap with doping is reported.
dc.description7 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0809.2820
dc.identifierhttp://arxiv.org/abs/0809.2820
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/169597
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleDoping-Driven Collapse of the SDW Correlation Gap in SmFeAsO$_{1-x}$F$_{x}$
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