Violation of the Mott–Ioffe–Regel limit: high-temperature resistivity of itinerant magnets Srn+1RunO3n+1 (n=2,3,∞) and CaRuO3

Cao, Gang; Song, Wei; Sun, Yuan; Lin, X. N.

doi:10.1016/j.ssc.2004.03.001

Cited by 28 publications

(15 citation statements)

References 27 publications

(83 reference statements)

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“…On the other hand, the ruthenates have been also pictured as influenced substantially by the proximity to the magnetic transition and the corresponding magnetic fluctuations 16 which brings to the problem ingredients whose photoemission signatures are understood less well.…”

Section: Introductionmentioning

confidence: 99%

Photoemission and DMFT study of electronic correlations inSrMoO3: Effects of Hund's rule coupling and possible plasmonic sideband

et al. 2014

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We investigate the electronic structure of a perovskite-type Pauli paramagnet SrMoO3 (t2g 2 ) thin film using hard x-ray photoemission spectroscopy and compare the results to the realistic calculations that combine the density functional theory within the local-density approximation (LDA) with the dynamical-mean field theory (DMFT). Despite the clear signature of electron correlations in the electronic specific heat, the narrowing of the quasiparticle bands is not observed in the photoemission spectrum. This is explained in terms of the characteristic effect of Hund's rule coupling for partiallyfilled t2g bands, which induces strong quasiparticle renormalization already for values of Hubbard interaction which are smaller than the bandwidth. The interpretation is supported by additional model DMFT calculations including Hund's rule coupling, that show renormalization of low-energy quasiparticles without affecting the overall bandwidth. The photoemission spectra show additional spectral weight around −2 eV that is not present in the LDA+DMFT. We interpret this weight as a plasmon satellite, which is supported by measured Mo, Sr and Oxygen core-hole spectra that all show satellites at this energy.

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Section: Introductionmentioning

confidence: 99%

Photoemission and DMFT study of electronic correlations inSrMoO3: Effects of Hund's rule coupling and possible plasmonic sideband

et al. 2014

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“…Recent studies on correlated metals such as MnSi [9] and Sr 3 Ru 2 O 7 [7,8,10] reveal phenomena consistent with quantum criticality due to the onset of itinerant ferromagnetism and the critical end-point of a first-order metamagnetic transition, respectively. The essence of this physics has been captured by a simple model [11] invoking a minimum of g(E) (MnSi) and a two- former are on the verge of a metal-insulator transition and prone to antiferromagnetism that changes with n, whereas the latter are metallic, and evolve from paramagnetism (n=1, 2) to a ferromagnetic state (n=∞) with increasing n [7,8,10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Borderline magnetism inSr4Ru3O10: Impact of La and Ca doping on itinerant ferromagnetism and metamagnetism

et al. 2006

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“…They exhibit a very small coherence scale T F L , as well as a crossover into "bad metal" regime [25][26][27][28][29][30]. Surprisingly the single layered compounds Sr 2 RuO 4 is more metallic than the pseudocubic SrRuO 3 and CaRuO 3 at relative low temperature (≤ 400K).…”

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confidence: 99%

Transport Properties of Metallic Ruthenates: ADFT+DMFTInvestigation

2016

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We present a systematical theoretical study on the transport properties of an archetypal family of Hund's metals, Sr2RuO4, Sr3Ru2O7, SrRuO3 and CaRuO3, within the combination of first principles density functional theory and dynamical mean field theory. The agreement between theory and experiments for optical conductivity and resistivity is good, which indicates that electron-electron scattering dominates the transport of ruthenates. We demonstrate that in the single-site dynamical mean field approach the transport properties of Hund's metals fall into the scenario of "resilient quasiparticles". We explains why the single layered compound Sr2RuO4 has a relative weak correlation with respect to its siblings, which corroborates its good metallicity. PACS numbers: 71.27.+a, The anomalous transport properties in correlated metals have been of great interest for many decades, but the main focus was the electron-electron scattering due to Hubbard-like short range repulsion. Many features found in realistic materials are well captured by the dynamical mean field theory (DMFT) in simple Hubbard models [1,2], for example, the very low coherence scale T F L below which Fermi liquid (FL) theory holds [3], and the high temperature "bad metal" behavior that resistivity exceeds the Mott-Ioffe-Regel limit [4]. In the broad crossover regime between FL and "bad metal" the "resilient quasiparticles" which survive up to high temperature [5,6] dominate the transport. Very recently Hund's metals [7] have attracted a lot of attentions. These are materials in which the Hund's interaction rather than the Hubbard repulsion gives rise to the heavy quasiparticle mass in several transition metal compounds such as iron pnictides [8] and ruthenates [9,10]. The understanding of the scattering mechanism in Hund's metals and their consequences for the transport properties have not been explored much.In this paper we study the archetypal Hund's metals [9][10][11], the metallic members of Ruddlesden-Popper serials of ruthenates (A n+1 B n O 3n+1 ): Sr 2 RuO 4 (n = 1), Sr 3 Ru 2 O 7 (n = 2), SrRuO 3 and CaRuO 3 (n = ∞).Ruthenates have been extensively studied as prototypical strongly correlated systems, with large effective mass enhancements revealed by various experiments [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. They exhibit a very small coherence scale T F L , as well as a crossover into "bad metal" regime [25][26][27][28][29][30]. Surprisingly the single layered compounds Sr 2 RuO 4 is more metallic than the pseudocubic SrRuO 3 and CaRuO 3 at relative low temperature (≤ 400K). This is different from many other systems, for example, the Ruddlesden-Popper family of strontium vanadates, lanthanum nickelates, lanthanum cuprates, strontium iridates, where the single layered compounds are insulating and the pseudocubic ones are metallic.The method used in this paper is the combination of density functional theory and DMFT (DFT+DMFT) in the charge self-consistent and all electron formulation that avoids building the low energy Hubb...

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Violation of the Mott–Ioffe–Regel limit: high-temperature resistivity of itinerant magnets Srn+1RunO3n+1 (n=2,3,∞) and CaRuO3

Cited by 28 publications

References 27 publications

Photoemission and DMFT study of electronic correlations inSrMoO3: Effects of Hund's rule coupling and possible plasmonic sideband

Photoemission and DMFT study of electronic correlations inSrMoO3: Effects of Hund's rule coupling and possible plasmonic sideband

Borderline magnetism inSr4Ru3O10: Impact of La and Ca doping on itinerant ferromagnetism and metamagnetism

Transport Properties of Metallic Ruthenates: ADFT+DMFTInvestigation

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