Enhanced electron correlations at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>VO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>surface

Laverock, J.; Kuyyalil, Jithesh; Chen, Bin; Singh, R. P.; Karlin, B. A.; Woicik, J. C.; Smith, Kevin

doi:10.1103/physrevb.91.165123

Cited by 12 publications

(12 citation statements)

References 35 publications

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“…All this indicates that correlation effects are strongly enhanced at the surface relative to the inner layers, in good agreement with experimental observations for CaVO 3 and the closely related material SrVO 3 [33,34,51,52] and previous DFT+DMFT calculations for SrVO 3 [35,53]. In particular, close to U mit but still in the metallic phase, the surface seems to form a "dead layer", with nearly vanishing quasiparticle weight, as discussed in Ref.…”

Section: Effect Of Dimensional Confinementsupporting

confidence: 91%

Metal-insulator transition in CaVO3 thin films: Interplay between epitaxial strain, dimensional confinement, and surface effects

et al. 2018

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We use density functional theory plus dynamical mean-field theory (DFT+DMFT) to study multiple control parameters for tuning the metal-insulator transition (MIT) in CaVO3 thin films. We focus on separating the effects resulting from substrate-induced epitaxial strain from those related to the reduced thickness of the film. We show that tensile epitaxial strain of around 3-4% is sufficient to induce a transition to a paramagnetic Mott-insulating phase. This corresponds to the level of strain that could be achieved on a SrTiO3 substrate. Using free-standing slab models, we then demonstrate that reduced film thickness can also cause a MIT in CaVO3, however, only for thicknesses of less than 4 perovskite units. Our calculations indicate that the MIT in such ultra-thin films results mainly from a surface-induced crystal-field splitting between the t2g-orbitals, favoring the formation of an orbitally-polarized Mott insulator. This surface-induced crystal-field splitting is of the same type as the one resulting from tensile epitaxial strain, and thus the two effects can also cooperate. Furthermore, our calculations confirm an enhancement of correlation effects at the film surface, resulting in a reduced quasiparticle spectral weight in the outermost layer, whereas bulk-like properties are recovered within only a few layers away from the surface.

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Section: Effect Of Dimensional Confinementsupporting

confidence: 91%

Metal-insulator transition in CaVO3 thin films: Interplay between epitaxial strain, dimensional confinement, and surface effects

et al. 2018

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“…The quasi two-dimensional (2D) rare-earth tritellurides RTe3 (R = La-Nd, Sm, Gd-Tm) are prime examples of CDW ordered ground states. Angle-resolved photoemission spectroscopy (ARPES) measurements [16] [17] of several rare-earth tritelluride compounds lead to the assumption of a nesting driven CDW order and, hence, RTe3 are often regarded as canonical Peierls-like CDW systems. On the other hand, theoretical investigations of RTe3 [18] revealed a nesting feature, i.e.…”

Section: Introductionmentioning

confidence: 99%

Competing soft phonon modes at the charge-density-wave transitions in DyTe3

et al. 2018

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The family of rare-earth tritellurides RTe3 features charge-density-wave (CDW) order related to strongly momentum-dependent electron-phonon coupling. Similar to other CDW compounds, superconductivity is observed when the CDW order is suppressed via hydrostatic pressure [1]. What sets the heavier members of the RTe3 series apart is the observation of a second CDW transition at lower temperatures having an in-plane ordering wavevector , ∥ [ ] of almost the same magnitude but orthogonal to the ordering wavevector , ∥ [ ] observed at higher temperatures [2]. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of DyTe3. In particular, we show that there are several phonon modes along both in-plane directions, which respond to the onset of the CDW transition at , =. Surprisingly, these soft modes close to , = ( . , , ) show strong softening near , but do not exhibit any response to the lower-temperature transition at , = . Our results indicate that the low-temperature CDW order is not just the 90° rotated analogue of the one appearing at high temperatures.

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“…It has been pointed out by Sarma and co-workers [10,11] that the incoherent part for SrVO 3 and CaVO 3 has a lot of contributions from surface states through photoemission studies using different photon energies. In fact, a recent hard x-ray photoemission study revealed enhanced coherent spectral weight due to the bulk sensitivity [12]. Therefore, one should be careful when the spectral weight transfer and the effect of electron correlation are analyzed quantitatively.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, a recent hard x-ray photoemission study revealed enhanced coherent spectral weight due to the bulk sensitivity [12]. Therefore, one should be careful when the spectral weight transfer and the effect of electron correlation are analyzed quantitatively.…”

mentioning

confidence: 99%

Correlated electronic states of SrVO 3 revealed by angle-resolved photoemission spectroscopy

Yoshida

Kobayashi

Yoshimatsu

et al. 2016

Journal of Electron Spectroscopy and Related Phenomena

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In this article, we review recent progress in angle-resolved photoemission (ARPES) studies of the Mott-Hubbard-type correlated electron systems SrVO 3 . It has the d 1 electron configuration and is an ideal model compound to study electron correlation effects in normal metal. ARPES studies of bulk single-crystal SrVO 3 and CaVO 3 have revealed the difference in the mass renormalization of electrons between them. In-situ ARPES studies of thin films fabricated by the pulsed laser deposition method have clarified not only quasi-particle dispersions, which show a kink like high-T c cuprates, but also finite dispersions in the incoherent part. Self-energy in a wide energy range has been deduced from the ARPES spectral weight using Kramers-Kronig transformation. The obtained self-energy has several structures which yield the incoherent feature and a pseudogap-like dip similar to the high-T c cuprates. Quantum-well states in ultrathin films of SrVO 3 have revealed sub-bands with correlated electrons. These findings of electron correlation effects outlined in the present article would provide a starting point not only for fundamental condensed-matter physics but also for the development of new devices with correlated electrons.

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Enhanced electron correlations at theSrxCa1−xVO3surface

Cited by 12 publications

References 35 publications

Metal-insulator transition in CaVO3 thin films: Interplay between epitaxial strain, dimensional confinement, and surface effects

Metal-insulator transition in CaVO3 thin films: Interplay between epitaxial strain, dimensional confinement, and surface effects

Competing soft phonon modes at the charge-density-wave transitions in DyTe3

Correlated electronic states of SrVO 3 revealed by angle-resolved photoemission spectroscopy

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