The crystalline electric field as a probe for long range antiferromagnetic order and superconductivity in CeFeAsO$_{1-x}$F$_x$

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dc.creatorChi, Songxue
dc.creatorAdroja, D. T.
dc.creatorGuidi, T.
dc.creatorBewley, R.
dc.creatorLi, Shiliang
dc.creatorZhao, Jun
dc.creatorLynn, J. W.
dc.creatorBrown, C. M.
dc.creatorQiu, Y.
dc.creatorChen, G. F.
dc.creatorLou, J. L.
dc.creatorWang, N. L.
dc.creatorDai, Pengcheng
dc.date2008-07-31
dc.date.accessioned2026-07-07T10:19:20Z
dc.date.available2026-07-07T10:19:20Z
dc.descriptionWe use inelastic neutron scattering to study the crystalline electric field (CEF) excitations of Ce$^{3+}$ in CeFeAsO$_{1-x}$F$_{x}$($x=0,0.16$). For nonsuperconducting CeFeAsO, the Ce CEF levels have three magnetic doublets in the paramagnetic state, but these doublets split into six singlets when Fe ions order antiferromagnetically. For superconducting CeFeAsO$_{0.84}$F$_{0.16}$ ($T_c=41$ K), where the static AF order is suppressed, the Ce CEF levels have three magnetic doublets at $\hbarω=0,18.7,58.4$ meV at all temperatures. Careful measurements of the intrinsic linewidth $Γ$ and the peak position of the 18.7 meV mode reveal clear anomaly at $T_c$, consistent with a strong enhancement of local magnetic susceptibility $χ^{\prime\prime}(\hbarω)$ below $T_c$. These results suggest that CEF excitations in the rare-earth oxypnictides can be used as a probe of spin dynamics in the nearby FeAs planes.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0807.4986
dc.identifierhttp://arxiv.org/abs/0807.4986
dc.identifierPhys. Rev. Lett., 101, 217002 (2008)
dc.identifierdoi:10.1103/PhysRevLett.101.217002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174473
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleThe crystalline electric field as a probe for long range antiferromagnetic order and superconductivity in CeFeAsO$_{1-x}$F$_x$
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