Scaling behavior in thermoelectric misfit cobalt oxides

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dc.creatorLimelette, P.
dc.creatorHebert, S.
dc.creatorHardy, V.
dc.creatorFresard, R.
dc.creatorSimon, Ch.
dc.creatorMaignan, A.
dc.date2006-08-11
dc.date.accessioned2026-07-07T07:19:38Z
dc.date.available2026-07-07T07:19:38Z
dc.descriptionWe investigate both thermoelectric and thermodynamic properties of the misfit cobalt oxide [Bi$_{1.7}$Co$_{0.3}$Ca$_{2}$O$_{4}$]$^{RS}_{0.6}$CoO$_{2}$. A large negative magnetothermopower is found to scale with both magnetic field and temperature revealing a significant spin entropy contribution to thermoelectric properties giving rise to a constant S$_0\approx$ 60 $μ$V K$^{-1}$ equal to the high temperature asymptotic value of the spin 1/2 entropy. Low temperature specific heat measurements allow us to determine an enhanced electronic part with $γ\approx$ 50 mJ (mol K$^{2}$)$^{-1}$ attesting of strong correlations. Thereby, a critical comparison between [Bi$_{1.7}$Co$_{0.3}$Ca$_{2}$O$_{4}$]$^{RS}_{0.6}$CoO$_{2}$, other cobaltites as well as other materials reveals a universal behavior of the thermopower low temperature slope as a function of $γ$ testifying thus a purely electronic origin. This potentially generic scaling behavior suggests here that the high room temperature value of the thermopower in misfit cobalt oxides results from the addition of a spin entropy contribution to an enlarged electronic one.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0608264
dc.identifierhttp://arxiv.org/abs/cond-mat/0608264
dc.identifierPhys. Rev. Lett 97, 046601 (2006)
dc.identifierdoi:10.1103/PhysRevLett.97.046601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/114698
dc.subjectStrongly Correlated Electrons
dc.titleScaling behavior in thermoelectric misfit cobalt oxides
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