Competing orbital ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mi mathvariant="normal">V</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>compounds: High-resolution x-ray diffraction and thermal expansion

Sage, M. H.; Blake, Graeme R.; Marquina, C.; Palstra, Thomas

doi:10.1103/physrevb.76.195102

Cited by 74 publications

(108 citation statements)

References 32 publications

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“…24,27,39 Our results clearly show that orbital fluctuations are suppressed not only in strongly distorted YVO 3 but also for large R ions such as in pseudocubic CeVO 3 .…”

Section: B Comparison With Literaturementioning

confidence: 53%

“…7 However, distortions away from cubic symmetry give rise to both a crystal-field splitting of the t 2g orbitals and a reduction of superexchange interactions. The orthorhombic splitting ε = (b − a)/(b + a) between the lattice parameters a and b amounts to 0.03 for R = Y and Gd and only 0.003 for Ce 25,27,38 while the V-O-V bond angle increases from about 144…”

Section: B Comparison With Literaturementioning

confidence: 97%

“…[24][25][26][27] A phase transition to a monoclinic phase (P 2 1 /b) is observed at T ∞ ≈ 200 K (R = Y), 208 K (Gd), and 154 K (Ce), and antiferromagnetic order sets in at T N ≈ 116 K (Y), 122 K (Gd), and 134 K (Ce). 24,26,[28][29][30] YVO 3 shows a further phase transition at T S = 77 K to a low-temperature orthorhombic phase, 24,25 which is absent for R = Gd and Ce.…”

Section: Orbital Ordermentioning

confidence: 99%

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Probing orbital fluctuations inRVO3(R=<

et al. 2012

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We study optical excitations across the Mott gap in the multiorbital Mott-Hubbard insulators RVO 3 . The multipeak structure observed in the optical conductivity can be described consistently in terms of the different 3d 3 multiplets or upper Hubbard bands. The spectral weight is very sensitive to nearest-neighbor spin-spin and orbital-orbital correlations and thus shows a pronounced dependence on both temperature and polarization. Comparison with theoretical predictions based on either rigid orbital order or strong orbital fluctuations clearly rules out that orbital fluctuations are strong in RVO 3 . Both the line shape and the temperature dependence give clear evidence for the importance of excitonic effects.

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“…24,27,39 Our results clearly show that orbital fluctuations are suppressed not only in strongly distorted YVO 3 but also for large R ions such as in pseudocubic CeVO 3 .…”

Section: B Comparison With Literaturementioning

confidence: 53%

Section: B Comparison With Literaturementioning

confidence: 97%

Section: Orbital Ordermentioning

confidence: 99%

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Probing orbital fluctuations inRVO3(R=<

et al. 2012

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“…It is clear that the nonmonotonic dependence of T OO on r R cannot be reproduced just by the superexchange, as a maximum in T OO requires two mechanisms which oppose each other. In fact, the decreasing V-O-V angle (Θ along the c axis) with decreasing ionic radius r R along the RVO 3 perovskites [40][41][42][43] reduces somewhat both the hopping t and superexchange J (6), but we shall ignore this effect here and concentrate ourselves on the leading dependence on orbital correlations which are controlled by lattice distortions.…”

Section: Spin-orbital-lattice Couplingmentioning

confidence: 99%

“…(42), which is related to the ionic size by Eq. (43). Functional dependence of the crystal-field splitting E z ∝ sin 3 ϑ cos ϑ on the angle ϑ may be derived from the point charge model [30], using the structural data for the RVO 3 perovskites [40][41][42][43].…”

Section: Dependence On Lattice Distortionmentioning

confidence: 99%

Orbital Fluctuations in the RVO3 Perovskites

Oleś¹,

Horsch²

2009

NATO Science for Peace and Security Series B: Physics and Biophysics

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The properties of Mott insulators with orbital degrees of freedom are described by spin-orbital superexchange models, which provide a theoretical framework for understanding their magnetic and optical properties. We introduce such a model derived for (xy) 1 (yz/zx) 1 configuration of V 3+ ions in the RVO 3 perovskites, R=Lu,Yb,· · ·,La, and demonstrate that {yz, zx} orbital fluctuations along the c axis are responsible for the huge magnetic and optical anisotropies observed in the almost perfectly cubic compound LaVO 3 . We argue that the GdFeO 3 distortion and the large difference in entropy of C-AF and G-AF phases is responsible for the second magnetic transition observed at T N2 in YVO 3 . Next we address the variation of orbital and magnetic transition temperature, T OO and T N1 , in the RVO 3 perovskites, after extending the spin-orbital model by the crystal-field and the orbital interactions which arise from the GdFeO 3 and Jahn-Teller distortions of the VO 6 octahedra. We further find that the orthorhombic distortion which increases from LaVO 3 to LuVO 3 plays a crucial role by controlling the orbital fluctuations, and via the modified orbital correlations influences the onset of both magnetic and orbital order.

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Frontiers in the Growth of Complex Oxide Thin Films: Past, Present, and Future of Hybrid MBE

Brahlek

Gupta

Lapano

et al. 2017

Adv Funct Materials

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Driven by an ever-expanding interest in new material systems with new functionality, the growth of atomic-scale electronic materials by molecular beam epitaxy (MBE) has evolved continuously since the 1950s. Here, a new MBE technique called hybrid-MBE (hMBE) is reviewed that has been proven a powerful approach for tackling the challenge of growing high-quality, multicomponent complex oxides, specifically the ABO 3 perovskites. The goal of this work is to (1) discuss the development of hMBE in a historical context, (2) review the advantageous surface kinetics and chemistry that enable the self-regulated growth of ABO 3 perovskites, (3) layout the key components and technical challenges associated with hMBE, (4) review the status of the field and the materials that have been successfully grown by hMBE which demonstrate its general applicability, and (5) discuss the future of hMBE in regards to technical innovations and expansion into new material classes, which are aimed at expanding into industrial realm and at tackling new scientific endeavors.

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Competing orbital ordering inRVO3compounds: High-resolution x-ray diffraction and thermal expansion

Cited by 74 publications

References 32 publications

Probing orbital fluctuations inRVO3(R=<

Probing orbital fluctuations inRVO3(R=<

Orbital Fluctuations in the RVO3 Perovskites

Frontiers in the Growth of Complex Oxide Thin Films: Past, Present, and Future of Hybrid MBE

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