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Fujimori, A.; Saeki, Masanobu; Nozaki, Hirōshi

doi:10.1103/physrevb.44.163

Cited by 19 publications

(18 citation statements)

References 30 publications

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“…On the other hand, the discrepancy is much smaller in the sulfides of early transition metals. 14,15 In accordance with those studies, our result suggests that electron correlation has a relatively small effect on the electronic structure of CuV 2 S 4 .…”

Section: Methodssupporting

confidence: 92%

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

et al. 2001

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We have studied the electronic structure and its changes across the charge-density-wave ͑CDW͒ transition in spinel-type CuV 2 S 4 by photoemission spectroscopy and first-principles band-structure calculations. The photoemission spectra show pseudogap-like behavior and the gap size is estimated to be ϳ90 meV. The large energy scale of the pseudogap compared to the transition temperature and its anomalous temperature dependence implies that the involved interaction is in the strong-coupling regime. The calculated electronic susceptibility (q) shows a small peak at qӍ 11 40 ͓110͔, which is consistent with the observed wave vector q Ӎ 1 4 ͓110͔ characterizing the CDW. This result suggests that Fermi surface nesting is at least partly responsible for the CDW formation.

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Section: Methodssupporting

confidence: 92%

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

et al. 2001

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“…Mott gap by Hund's coupling for a non half-filled shell was proposed early on by Fujimori et al [44] in order to explain the paramagnetic metallic character of V 5 S 8 and its photoemission spectrum showing an exchange splitting.…”

Section: Energetics Of the Mott Gapmentioning

confidence: 99%

Strong Correlations from Hund’s Coupling

Georges

Medici

Mravlje

2013

Annu. Rev. Condens. Matter Phys.

820

881

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Strong electronic correlations are often associated with the proximity of a Mott insulating state. In recent years however, it has become increasingly clear that the Hund's rule coupling (intra-atomic exchange) is responsible for strong correlations in multi-orbital metallic materials which are not close to a Mott insulator. Hund's coupling has two effects: it influences the energetics of the Mott gap and strongly suppresses the coherence scale for the formation of a Fermi-liquid. A global picture has emerged recently, which emphasizes the importance of the average occupancy of the shell as a control parameter. The most dramatic effects occur away from half-filling or single occupancy. The theoretical understanding and physical properties of these 'Hund's metals' are reviewed, together with the relevance of this concept to transition-metal oxides of the 3d, and especially 4d series (such as ruthenates), as well as to the iron-based superconductors (iron pnictides and chalcogenides).

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“…V 5 S 8 (also reported as VS 1.64 or V 1.25 S 2 ) has a monoclinic NiAs-type crystal structure with space group C2/m (Figure 1a, b) and an antiferromagnetic ground state, with T N ~ 32 K. [11][12][13] This material can be relabeled V 0.25 VS 2 , to reflect that a fraction of the vanadium atoms are intercalated within the van der Waals gap between VS 2 layers (Figure 1a). 14 Early NMR measurements showed that the V sites are not all equivalent 15,16 ; neutron diffraction measurements indicate that the V I sites (the intercalated V atoms, oxidation state V 3+ ) have localized 3d electrons with local moments at least ~ 1.1 µ B /V I , while the V II and V III sites' 3d electrons are itinerant, resulting in metallicity. 11,[17][18][19] Experiments 20 at helium temperatures showed a low-field H||c positive MR sharply switching to negative MR above ~ 4.2 T. While initially modeled as field-induced suppression of AFM order, 18 this sharp feature was identified in bulk samples as the spin-flop transition, 14,18 with the magnetic easy axis oriented 17,20 ~10º away from c toward the a axis.…”

mentioning

confidence: 99%

“…14 Early NMR measurements showed that the V sites are not all equivalent 15,16 ; neutron diffraction measurements indicate that the V I sites (the intercalated V atoms, oxidation state V 3+ ) have localized 3d electrons with local moments at least ~ 1.1 µ B /V I , while the V II and V III sites' 3d electrons are itinerant, resulting in metallicity. 11,[17][18][19] Experiments 20 at helium temperatures showed a low-field H||c positive MR sharply switching to negative MR above ~ 4.2 T. While initially modeled as field-induced suppression of AFM order, 18 this sharp feature was identified in bulk samples as the spin-flop transition, 14,18 with the magnetic easy axis oriented 17,20 ~10º away from c toward the a axis. Figure S7 shows the magnetic structure of the bulk material and the spin-flopped configuration.…”

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confidence: 99%

Thickness-Dependent and Magnetic-Field-Driven Suppression of Antiferromagnetic Order in Thin V₅S₈ Single Crystals

et al. 2016

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With materials approaching the 2D limit yielding many exciting systems with intriguing physical properties and promising technological functionalities, understanding and engineering magnetic order in nanoscale, layered materials is generating keen interest. One such material is V5S8, a metal with an antiferromagnetic ground state below the Néel temperature TN ∼ 32 K and a prominent spin-flop signature in the magnetoresistance (MR) when H∥c ∼ 4.2 T. Here we study nanoscale-thickness single crystals of V5S8, focusing on temperatures close to TN and the evolution of material properties in response to systematic reduction in crystal thickness. Transport measurements just below TN reveal magnetic hysteresis that we ascribe to a metamagnetic transition, the first-order magnetic-field-driven breakdown of the ordered state. The reduction of crystal thickness to ∼10 nm coincides with systematic changes in the magnetic response: TN falls, implying that antiferromagnetism is suppressed; and while the spin-flop signature remains, the hysteresis disappears, implying that the metamagnetic transition becomes second order as the thickness approaches the 2D limit. This work demonstrates that single crystals of magnetic materials with nanometer thicknesses are promising systems for future studies of magnetism in reduced dimensionality and quantum phase transitions.

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Electron correlation,d-band formation, and magnetism inV5S8

Cited by 19 publications

References 30 publications

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

Strong Correlations from Hund’s Coupling

Thickness-Dependent and Magnetic-Field-Driven Suppression of Antiferromagnetic Order in Thin V₅S₈ Single Crystals

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Electron correlation,d-band formation, and magnetism inV5S8

Cited by 19 publications

References 30 publications

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

Strong Correlations from Hund’s Coupling

Thickness-Dependent and Magnetic-Field-Driven Suppression of Antiferromagnetic Order in Thin V5S8 Single Crystals

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Product

Resources

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Thickness-Dependent and Magnetic-Field-Driven Suppression of Antiferromagnetic Order in Thin V₅S₈ Single Crystals