Strongly correlated properties of the thermoelectric cobalt oxide Ca3Co4O9

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dc.creatorLimelette, P.
dc.creatorHardy, V.
dc.creatorAuban-Senzier, P.
dc.creatorJerome, D.
dc.creatorFlahaut, D.
dc.creatorHebert, S.
dc.creatorFresard, R.
dc.creatorSimon, Ch.
dc.creatorNoudem, J.
dc.creatorMaignan, A.
dc.date2005-05-19
dc.date.accessioned2026-07-07T03:05:16Z
dc.date.available2026-07-07T03:05:16Z
dc.descriptionWe have performed both in-plane resistivity, Hall effect and specific heat measurements on the thermoelectric cobalt oxide Ca$_{3}$Co$_{4}$O$_{9}$. Four distinct transport regimes are found as a function of temperature, corresponding to a low temperature insulating one up to $T_{min}\approx $63 K, a strongly correlated Fermi liquid up to $T^*\approx $140 K, with $ρ=ρ_0+AT^2$ and $A\approx 3.63$ $10^{-2} μΩcm/K^{2}$, followed by an incoherent metal with $k_Fl\leq 1$ and a high temperature insulator above T$^{**}\approx $510 K . Specific heat Sommerfeld coefficient $γ= 93$ mJ/(mol.K$^{2}$) confirms a rather large value of the electronic effective mass and fulfils the Kadowaki-Woods ratio $A/γ^2 \approx 0.45$ 10$^{-5}$ $μΩcm.K^2/(mJ^2mol^{-2})$. Resistivity measurements under pressure reveal a decrease of the Fermi liquid transport coefficient A with an increase of $T^*$ as a function of pressure while the product $A(T^*)^2/a$ remains constant and of order $h/e^2$. Both thermodynamic and transport properties suggest a strong renormalization of the quasiparticles coherence scale of order $T^*$ that seems to govern also thermopower.
dc.description5 pages, 6 figures, accepted for publication in Physical Review B
dc.identifierhttps://arxiv.org/abs/cond-mat/0505464
dc.identifierhttp://arxiv.org/abs/cond-mat/0505464
dc.identifierPhys. Rev. B. 71, 233108 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.233108
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26385
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleStrongly correlated properties of the thermoelectric cobalt oxide Ca3Co4O9
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