Spin-orbital entangled molecular jeff states in lacunar spinel compounds

Kim, Heung Sik; Im, Jino; Han, Myung Joon; Jin, Hosub

doi:10.1038/ncomms4988

Cited by 68 publications

(75 citation statements)

References 55 publications

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“…The insulating states of compounds with an experimentally accessible Mott-like phase boundary including Ni(S 1−x Se x ) 2 ,[79] GaTa 4 Se 8 [80,81], Na 4 Ir 3 O 8 [82,83], and the quasi-two-dimensional organic systems [84], and EtMe 3 Sb[Pd(dmit) 2 ] 2 [11] have all been found to be magnetically frustrated. Conversely the spin-liquid-like properties of the latter two compounds have been associated with the increased range and nature of spin-spin interactions near the Mott transition.…”

Section: Discussionmentioning

confidence: 99%

Frustrated Magnetism in Mott Insulating (V1−xCrx)2<

et al. 2019

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V2O3 famously features all four combinations of paramagnetic vs antiferromagnetic, and metallic vs insulating states of matter in response to %-level doping, pressure in the GPa range, and temperature below 300 K. Using time-of-flight neutron spectroscopy combined with density functional theory calculations of magnetic interactions, we have mapped and analyzed the inelastic magnetic neutron scattering cross section over a wide range of energy and momentum transfer in the chromium stabilized antiferromagnetic and paramagnetic insulating phases (AFI & PI). Our results reveal an important magnetic frustration and degeneracy of the PI phase which is relieved by the rhombohedral to monoclinic transition at TN = 185 K. This leads to the recognition that magnetic frustration is an inherent property of the paramagnetic phase in (V1−xCrx)2O3 and plays a key role in suppressing the magnetic long range ordering temperature and exposing a large phase space for the paramagnetic Mott metal-insulator transition to occur.

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Section: Discussionmentioning

confidence: 99%

Frustrated Magnetism in Mott Insulating (V1−xCrx)2<

et al. 2019

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“…Finally, there exists a large family of cluster magnets in which the electrons are localized on the cluster units and form CMIs [5][6][7][8][9][10][11][12][13]19,20 . The physical properties of many of these cluster magnets have not been explored carefully.…”

Section: Discussionmentioning

confidence: 99%

“…The two emergent orbital states that are defined in Eqs. (11) and (12) comprise the two-dimensional E-type irreducible representation of the point group, and thus their two-fold degeneracy is protected by the point group symmetry of the resonating hexagon.…”

Section: The Emergent Orbitals and The Local Momentsmentioning

confidence: 99%

“…In conventional Mott insulators, the electron charge localization creates the local spin moments at the lattice sites, and the orbital degree of freedom becomes active when the local crystal symmetry allows the degeneracy of the atomic orbitals 3 . Recently, the cluster Mott insulator emerge as a new type of Mott insulator in which the electrons are localized inside the cluster [5][6][7][8][9][10][11][12][13] . As a result, the keen interplay between the charge and the spin degrees of freedom in cluster Mott insulators (CMI) is often quite different from the conventional Mott insulator [5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

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Emergent orbitals in the cluster Mott insulator on a breathing kagome lattice

Chen

Lee

2018

Phys. Rev. B

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Motivated by the recent developments on cluster Mott insulating materials such as the cluster magnet LiZn2Mo3O8, we consider the strong plaquette charge ordered regime of the extended Hubbard model on a breathing Kagome lattice and reveal the properties of the cluster Mottness. The plaquette charge order arises from the inter-site charge interaction and the collective motion of three localized electrons on the hexagon plaquettes. This model leads naturally to a reduction of the local moments by 2/3 as observed in LiZn2Mo3O8. Furthermore, at low temperatures each hexagon plaquette contains an extra orbital-like degree of freedom in addition to the remaining spin 1/2. We explore the consequence of this emergent orbital degree of freedom. We point out the interaction between the local moments is naturally described by a Kugel-Khomskii spin-orbital model. We develop a parton approach and suggest a spin liquid ground state with spinon Fermi surfaces for this model. We further predict an emergent orbital order when the system is under a strong magnetic field. Various experimental consequences for LiZn2Mo3O8 are discussed, including an argument that the charge ordering much be short ranged if the charge per Mo is slightly off stoichiometry.

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“…Recently, several correlation effects have been reported for AB 4 X 8 lacunar spinels, including pressure-induced superconductivity [35], bandwidth-controlled metal-to-insulator transition [36,37], large negative magnetoresistance [38], a two-dimensional topological insulating state [39], resistive switching through electric field-induced transition [40][41][42], emergence of orbitally driven ferroelectricity [43], and an extended Néel-type skyrmion phase [44].…”

Section: Fig 7 the Calculated Structural Motif Of Re 4 S 4 Te 4 Strmentioning

confidence: 99%

Universal mechanism of tetrahedral metal cluster formation in structures with breathing pyrochlore sublattices

Таланов¹,

Таланов²

2017

Nanosystems: Phys. Chem. Math.

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A universal mechanism of tetrahedral metal cluster formation in crystal with geometrically frustrated pyrochlore sublattices is proposed. It has been shown that the critical irreducible representation τ , which generated the formation of metal clusters in non-centrosymmetrical F43m-phases from high symmetry phases with Fd3m space group, is a one dimensional irreducible representation κ 11 (τ 4 (A 2u )) (in Kovalev notation). The structural theory of metal cluster formation based on group theoretical calculations was published earlier for the case of A-ordered spinel. In this work, the theory is generalized in the case of any high symmetry Fd3m structures that include pyrochlore sublattices. We presented a brief review of such structures and mechanisms of the tetrahedral metal cluster formation. The existence of so called "breathing" pyrochlore sublattices in ordered phases is predicted theoretically. The groups of atoms, between which bond clusters, are found. These groups of atoms define electron correlation effects. Examples of tetrahedral metal cluster formation in ordered spinels, ordered lacunar spinels, ordered Laves phases (MgCu 4 Sn structural type) and ordered pyrochlore are considered. The theoretical results are confirmed by the known experimental facts.

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Spin-orbital entangled molecular jeff states in lacunar spinel compounds

Cited by 68 publications

References 55 publications

Frustrated Magnetism in Mott Insulating (V1−xCrx)2<

Frustrated Magnetism in Mott Insulating (V1−xCrx)2<

Emergent orbitals in the cluster Mott insulator on a breathing kagome lattice

Universal mechanism of tetrahedral metal cluster formation in structures with breathing pyrochlore sublattices

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