Origin of "hot-spots" in the pseudogap regime of Nd(1.85)Ce(0.15)CuO(4): LDA+DMFT+Sigma_k study

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dc.creatorKokorina, E. E.
dc.creatorKuchinskii, E. Z.
dc.creatorNekrasov, I. A.
dc.creatorPchelkina, Z. V.
dc.creatorSadovskii, M. V.
dc.creatorSekiyama, A.
dc.creatorSuga, S.
dc.creatorTsunekawa, M.
dc.date2008-04-17
dc.date.accessioned2026-07-07T12:22:06Z
dc.date.available2026-07-07T12:22:06Z
dc.descriptionMaterial specific electronic band structure of the electron-doped high-Tc cuprate Nd(1.85)Ce(0.15)CuO(4) (NCCO) is calculated within the pseudo gap regime, using the recently developed generalized LDA+DMFT+Sigma_k scheme. LDA/DFT (density functional theory within local density approximation) provides model parameters (hopping integral values, local Coulomb interaction strength) for the one-band Hubbard model, which is solved by DMFT (dynamical mean-field theory). To take into account pseudogap fluctuations LDA+DMFT is supplied with "external" k-dependent self-energy Sigma_k, which describes interaction of correlated conducting electrons with non-local Heisenberg-like antiferromagnetic (AFM) spin fluctuations responsible for pseudo gap formation. Within this LDA+DMFT+Sigma_k approach we demonstrate the formation of pronounced "hot-spots" on the Fermi surface (FS) map in NCCO, opposite to our recent calculations for Bi(2)Sr(2)CaCu(2)O(8-d) (Bi2212), which have produced rather extended region of FS "destruction". There are several physical reasons for this fact: (i) the "hot-spots" in NCCO are located closer to Brillouin zone center; (ii) correlation length of AFM fluctuations ξis larger for NCCO; (iii) pseudogap potential Δis stronger, than in Bi2212. Comparison of our theoretical data with recent bulk sensitive high-energy angle-resolved photoemission (ARPES) data for NCCO provides good semiquantitative agreement. Based on that comparison alternative explanation of the van-Hove singularity at -0.3 eV is proposed. Optical conductivity both for Bi2212 and NCCO is also calculated within LDA+DMFT+Sigma_k and compared with experimental results, demonstrating satisfactory agreement.
dc.description8 pages, 10 figures, 1 table
dc.identifierhttps://arxiv.org/abs/0804.2732
dc.identifierhttp://arxiv.org/abs/0804.2732
dc.identifierJETP, Vol. 107, Iss. 5, p. 828 (2008)
dc.identifierdoi:10.1134/S1063776108110137
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213537
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleOrigin of "hot-spots" in the pseudogap regime of Nd(1.85)Ce(0.15)CuO(4): LDA+DMFT+Sigma_k study
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