Evidence of charge disproportionation on the nickel sublattice in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>EuNiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>thin films: X-ray photoemission studies

Bilewska, Katarzyna; Wolna, E.; Edely, Mathieu; Ruello, P.; Szade, J.

doi:10.1103/physrevb.82.165105

Cited by 13 publications

(13 citation statements)

References 29 publications

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“…H. K. Yoo, et al observed the strain dependent FS superstructures in LaNiO 3 films [32], which may be due to the modification in the low-lying orbitals and crystal field splitting. It has been suggested that the existence of charge disproportionation in RNiO 3 is strongly related to the metal-insulator phase transition [26][27][28][29]. Our ARPES results on two differently strained films suggest the existence of a tunable electronic localization.…”

Section: Discussionmentioning

confidence: 49%

“…Experimentally, it is reported that the MIT temperature coincides with the Néel temperature T N depending on the ionic radius of R [4,5]. More recently, various groups have claimed that the MIT originates from the formation of charge-order due to NiO 6 octahedral distortions [25] or valence fluctuations between Ni 3+δ and Ni 3−δ ions [26][27][28][29]. An observed isotope effect supports this scenario [30].…”

Section: Introductionmentioning

confidence: 85%

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Tuning the metal-insulator transition inNdNiO3heterostructures via Fermi surface instability and spin fluctuations

et al. 2015

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We employed in-situ pulsed laser deposition (PLD) and angle-resolved photoemission spectroscopy (ARPES) to investigate the mechanism of the metal-insulator transition (MIT) in NdNiO3 (NNO) thin films, grown on NdGaO3(110) and LaAlO3(100) substrates. In the metallic phase, we observe three dimensional hole and electron Fermi surface (FS) pockets formed from strongly renormalized bands with well-defined quasiparticles. Upon cooling across the MIT in NNO/NGO sample, the quasiparticles lose coherence via a spectral weight transfer from near the Fermi level to localized states forming at higher binding energies. In the case of NNO/LAO, the bands are apparently shifted upward with an additional holelike pocket forming at the corner of the Brillouin zone. We find that the renormalization effects are strongly anisotropic and are stronger in NNO/NGO than NNO/LAO. Our study reveals that substrate-induced strain tunes the crystal field splitting, which changes the FS properties, nesting conditions, and spin-fluctuation strength, and thereby controls the MIT via the formation of an electronic order parameter with QAF ∼(1/4, 1/4, 1/4±δ).

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Section: Discussionmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 85%

Tuning the metal-insulator transition inNdNiO3heterostructures via Fermi surface instability and spin fluctuations

et al. 2015

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“…The density of states (DOS) of the valence band is closely related to the measured photoelectron intensity (spectral weight), and changes in the latter can be related to the opening of a gap during the MIT 19 , variation of the bandwidth 20 or the transfer of spectral weight between different parts of the valence band 21 . Photoemission measurements on RNiO 3 have been performed on polycrystalline samples [22][23][24][25][26] as well as on thin films [27][28][29][30] . Measurements on thin films, however, were only conducted using the relatively low resolution xray photoemission spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 99%

Unusual temperature dependence of the spectral weight near the Fermi level of NdNiO3thin films

et al. 2012

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We investigate the behavior of the spectral weight near the Fermi level of NdNiO3 thin films as a function of temperature across the metal-to-insulator transition (MIT) by means of ultraviolet photoelectron spectroscopy. The spectral weight was found to exhibit thermal hysteresis, similar to that of the dc conductivity. A detailed analysis of the temperature dependence reveals two distinct regimes of spectral loss close to the Fermi level. The temperature evolution of one regime is found to be independent from the MIT.

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“…Several recent publications detail the growth of thin film nickelates by metal-organic chemical vapor deposition and sputtering [15][16][17][18]. Recently thick (∼210 nm) ENO films have been grown by rf magnetron sputtering [19], but x-ray diffraction revealed an essentially textured structure of the samples.…”

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confidence: 99%

Epitaxial Stabilization of Ultrathin Films of Rare-Earth Nickelates

Meyers,

Moon,

Kareev

et al. 2011

Preprint

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We report on the synthesis of ultrathin films of highly distorted EuNiO 3 (ENO) grown by interrupted pulse laser epitaxy on YAlO 3 (YAO) substrates. Through mapping the phase space of nickelate thin film epitaxy, the optimal growth temperatures were found to scale linearly with the Goldschmidt tolerance factor.Considering the gibbs energy of the expanding film, this empirical trend is discussed in terms of epitaxial stabilization and the escalation of the lattice energy due to lattice distortions and decreasing symmetry.These findings are fundamental to other complex oxide perovskites, and provide a route to the synthesis of other perovskite structures in ultrathin-film form.

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Evidence of charge disproportionation on the nickel sublattice inEuNiO3thin films: X-ray photoemission studies

Cited by 13 publications

References 29 publications

Tuning the metal-insulator transition inNdNiO3heterostructures via Fermi surface instability and spin fluctuations

Tuning the metal-insulator transition inNdNiO3heterostructures via Fermi surface instability and spin fluctuations

Unusual temperature dependence of the spectral weight near the Fermi level of NdNiO3thin films

Epitaxial Stabilization of Ultrathin Films of Rare-Earth Nickelates

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