Jahn-Teller versus quantum effects in the spin-orbital material<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LuVO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Skoulatos, M.; Tóth, S.; Roessli, B.; Enderle, M.; Habicht, K.; Sheptyakov, Denis; Cervellino, Antonio; Freeman, P. G.; Reehuis, M.; Stunault, A.; McIntyre, Garry J.; Tung, Le Duc; Marjerrison, Casey; Pomjakushina, E.; Brown, P. J.; Khomskii, Daniel I.; Rüegg, Ch.; Kreyßig, A.; Goldman, A. I.; Goff, J. P.

doi:10.1103/physrevb.91.161104

Cited by 16 publications

(8 citation statements)

References 27 publications

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“…It has been under hot debate whether the classical Jahn-Teller orbital physics, or quantum orbital fluctuations, or a close interplay between them better account for the unusual behavior of t 2g electrons in vanadate perovskites. [4][5][6][7][8][9][10][11][12][13][14] In addition to the competition between different spin/orbital ordered ground states, spin-orbital entanglement from Kugel-Khomskii(KK)-type superexchange interactions 15 competes with the long-range ordered states and should be considered when understanding the orbital physics in RVO 3 perovskites. 16 With the largest rare earth ions among RVO 3 members, the pseudocubic LaVO 3 has been ex-tensively studied to understand the effect of orbital fluctuations on the magnetic ground state and anisotropic optical properties.…”

Section: Introductionmentioning

confidence: 99%

Lattice distortion in the spin-orbital entangled state in RVO3 perovskites

et al. 2019

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We report a thorough study of Y0.7La0.3VO3 single crystals by measuring magnetic properties, specific heat, thermal conductivity, x-ray and neutron diffraction with the motivation of revealing the lattice response to the spin-orbital entanglement in RVO3. Upon cooling from room temperature, the orbitally disordered paramagnetic state changes around T*∼220 K to spin-orbital entangled state which is then followed by a transition at TN =116 K to C-type orbital ordered (OO) and Gtype antiferromagnetic ordered (AF) ground state. In the temperature interval TN < T < T * , the VO 6/2 octahedra have two comparable in-plane V-O bonds which are longer than the out-of-plane V-O1 bond. This local structural distortion supports the spin-orbital entanglement of partially filled and degenerate yz/zx orbitals. However, this distortion is incompatible with the steric octahedral site distortion intrinsic to orthorhombic perovskites. Their competition induces a second order transition from the spin-orbital entangled state to C-OO/G-AF ground state where the long range OO suppresses the spin-orbital entanglement. Our analysis suggests that the spin-orbital entangled state and G-OO are comparable in energy and compete with each other. Rare earth site disorder favors the spin-orbital entanglement rather than a cooperative Jahn-Teller distortion. The results also indicate for LaVO3 a C-OO/G-AF state in Tt ≤ T ≤TN and an orbital flipping transition at Tt. arXiv:1809.03360v1 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 99%

Lattice distortion in the spin-orbital entangled state in RVO3 perovskites

et al. 2019

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“…LaTiO 3 and LaVO 3 are explained by such quantum fluctuations [83]. However this interpretation is rather questionable, there are alternative explanations of the observed effects [84,85].…”

Section: Quantum Effectsmentioning

confidence: 99%

Orbital physics: glorious past, bright future

Khomskii¹

2022

Preprint

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Transition metal (TM) compounds present a very big class of materials with quite diverse properties. There are among them insulators, metals, systems with insulator-metal transitions; most magnetic systems are TM compounds; there are among them also (high-T c ) superconductors. Their very rich properties are largely determined by the strong interplay of different degrees of freedom: charge; spin; orbital; lattice. Orbital effects play a very important role in these systemsand not only in them! The study of this field, initiated by Goodenough almost 70 years ago, turned out to be very fruitful and produced a lot of important results. In this short review I first discuss the basics of orbital physics, summarize the main achievements in this big field, in which Goodenough played a pivotal role and which are nowadays widely used to explain many properties of TM compounds. In the main part of the text I discuss novel developments and perspectives in orbital physics, which is still a very active field of research, constantly producing new surprises.

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“…It can lead to long-range interaction between orbitals via elastic forces [42,43], to the forma-tion of orbital-glass or Jahn-Teller glass state in systems with random Jahn-Teller impurities [261]. It also gives an alternative interpretation [262] of neutron scattering results of [259], and a different explanation [263] of the orbital to the orbiton excitations claimed to be observed in [260].…”

Section: Instead Of Conclusion: Old and Novel Manifestations Of Quant...mentioning

confidence: 99%

Orbital effects in solids: basics, recent progress and opportunities

Khomskii,

Streltsov

2020

Preprint

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The properties of transition metal compounds are largely determined by nontrivial interplay of different degrees of freedom: charge, spin, lattice, but also orbital ones. Especially rich and interesting effects occur in systems with orbital degeneracy. They result in the famous Jahn-Teller effect leading to a plethora of consequences, in static and in dynamic properties, including nontrivial quantum effects. In the present review we discuss the main phenomena in the physics of such systems, paying central attention to the novel manifestations of those. After shortly summarising the basic phenomena and their description, we concentrate on several specific directions in this field. One of them is the reduction of effective dimensionality in many systems with orbital degrees of freedom due to directional character of orbitals, with concomitant appearance of some instabilities leading in particular to the formation of dimers, trimers and similar clusters in a material. The properties of such cluster systems, largely determined by their orbital structure, are discussed in detail, and many specific examples of those in different materials are presented. Another big field which acquired special significance relatively recently is the role of relativistic spin-orbit interaction. The mutual influence of this interaction and the more traditional Jahn-Teller physics is treated in details in the second part of the review. In discussing all these questions special attention is paid to novel quantum effects in those.

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Jahn-Teller versus quantum effects in the spin-orbital materialLuVO3

Cited by 16 publications

References 27 publications

Lattice distortion in the spin-orbital entangled state in RVO3 perovskites

Lattice distortion in the spin-orbital entangled state in RVO3 perovskites

Orbital physics: glorious past, bright future

Orbital effects in solids: basics, recent progress and opportunities

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