Bulk electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Na</mml:mi></mml:mrow><mml:mrow><mml:mn>0.35</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CoO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>⋅</mml:mi><mml:mn>1.3</mml:mn><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mm

Chainani, A.; Yokoya, Takayoshi; Takata, Y.; Tamasaku, Kenji; Taguchi, M.; Shimojima, T.; Kamakura, N.; Horiba, Koji; Tsuda, S.; Shin, Shik; Miwa, D.; Nishino, Yoshinori; Ishikawa, Tetsuya; Yabashi, Makina; Kobayashi, Keisuke; Namatame, H.; Takeuchi, Masaki; Takada, Kazunori; Sasaki, Takayoshi; Sakuraï, H.; Takayama‐Muromachi, E.

doi:10.1103/physrevb.69.180508

Cited by 55 publications

(40 citation statements)

References 39 publications

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“…The preceding ARPES experimental results confirmed that the top postion of the e g band is doping independent, sinking below the Fermi energy, suggesting that it plays no role in the lowenergy phenomena [13][14][15][16][17][18][19][20] . The combined these ARPES experimental results [13][14][15][16][17][18][19][20] and the transport experimental data 6-10 therefore show that the essential low-energy physics of the cobaltates is dominated by the strong electron correlation. The strong-coupling Hubbard model and its equivalent, the t-J model, are prototypes to study the strong correlation effects in solids, especially in connection with the unconventional superconductivity 21,22 .…”

Section: Electron Momentum Distributionsupporting

confidence: 70%

“…The first principle band calculations predict that the cobaltates have a large EFS centered around the Γ point of the Brillouin zone (BZ) and six small pockets near the K points 11 . However, the angleresolved photoemission spectroscopy (ARPES) measurements on the cobaltates reveal only the large EFS [12][13][14][15][16][17][18][19][20] , while six small EFS pockets near the K points are absent. In particular, these ARPES experimental data also indicate that the area of EFS contains 1 + δ electrons, and therefore fulfills Luttinger's theorem 15,18,20 , where δ is the electron doping concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Although the evolution of EFS with doping in the cobaltates has been well established by now [12][13][14][15][16][17][18][19][20] , its full understanding is still a challenging issue. Within the framework of the local-spin-density approximation, the EFS topology in the cobaltates has been studied numerically by taking into account the onsite Coulomb interaction 23 , however, the obtained EFS area is twice as large, and therefore is inconsistent with the ARPES observations.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of electron Fermi surface with doping in cobaltates

Ma¹,

Lan²,

Qin³

et al. 2016

J. Phys.: Condens. Matter

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The notion of the electron Fermi surface is one of the characteristic concepts in the field of condensed matter physics, and it plays a crucial role in the understanding of the physical properties of doped Mott insulators. Based on the t-J model, we study the nature of the electron Fermi surface in the cobaltates, and qualitatively reproduce the essential feature of the evolution of the electron Fermi surface with doping. It is shown that the underlying hexagonal electron Fermi surface obeys Luttinger's theorem. The theory also predicts a Fermi-arc phenomenon at the low-doped regime, where the region of the hexagonal electron Fermi surface along the Γ-K direction is suppressed by the electron self-energy, and then six disconnected Fermi arcs located at the region of the hexagonal electron Fermi surface along the Γ-M direction emerge. However, this Fermi-arc phenomenon at the low-doped regime weakens with the increase of doping.

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Section: Electron Momentum Distributionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of electron Fermi surface with doping in cobaltates

Ma¹,

Lan²,

Qin³

et al. 2016

J. Phys.: Condens. Matter

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“…This proves that the films are not oxidised. A satellite arising from oxidation should appear around 10 eV below the main 2p 3/2 and 2p 1/2 peaks [45,42]. A typical satellite often observed in materials with a face-centred cubic lattice is clearly resolved at 4.0 eV below the 2p 3/2 maximum.…”

Section: Electronic Structurementioning

confidence: 99%

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Ouardi¹,

Fecher²,

Kubota³

et al. 2015

J. Phys. D: Appl. Phys.

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Abstract.Using circularly polarised radiation and a combination of bulk-sensitive hard X-ray photoelectron spectroscopy and X-ray-absorption spectroscopy (XAS) we studied the electronic and magnetic structure of epitaxial Mn 1.8 Co 1.2 Ga thin films. Spin resolved Bloch spectral functions, density of states as well as charge and magnetisation densities were investigated by a first-principles analysis of full potential, fully relativistic Korringa-Kohn-Rostoker calculations of the electronic structure. The valence states were experimentally investigated by using linear dichroism in the angular distribution and comparing the results to spin-resolved densities of states. The linear dichroism in the valence band enabled a symmetry analysis of the contributing states. The spectra were in good agreement with the theoretical partial density of states. The element-specific, spin-resolved, unoccupied densities of states for Co and Mn were analysed by using XAS and X-ray magnetic circular dichroism (XMCD) at the L 3,2 edges. The spectra were influenced by strong correlation effects. XMCD was used to extract the site resolved magnetic moments. The experimental values of m Mn = 0.7 µ B and m Co = 1.05 µ B agree very well with the calculated magnetic moments. Magnetic circular dichroism in angle-resolved photoelectron spectroscopy at the Mn and Co 2p core level exhibited a pronounced magnetic dichroism and confirmed the localised character of the Mn d valence states.

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“…We have studied the effect of Hubbard U on the electronic structures of Na 0.5 CoO 2 in the previous part of this section, but the actual value of U in this material is not determined yet, of which very different values are proposed in the literature 9,13,15,32 . Based on the folowing two experimental observes, we estimate that the vaule of U should be moderate, as also suggested by Lee et al 15 .…”

Section: Spinmentioning

confidence: 99%

Geometrical, electronic, and magnetic properties ofNa0.5CoO2from first principles

Yang

Hou

et al. 2005

Phys. Rev. B

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We report a first-principles projector augmented wave (PAW) study on Na 0.5 CoO 2 . With the sodium ion ordered insulating phase being identified in experiments, pure density functional calculations fail to predict an insulating ground state, which indicates that Na ordering alone can not produce accompanying Co charge ordering, if additional correlation is not properly considered. At this level of theory, the most stable phase presents ferromagnetic ordering within the CoO 2 layer and antiferromagnetic coupling between these layers. When the on-site Coulomb interaction for Co 3d orbitals is included by an additional Hubbard parameter U , charge ordered insulating ground state can be obtained. The effect of on-site interaction magnitude on electronic structure is studied. At a moderate value of U (4.0 eV for example), the ground state is antiferromagnetic, with a Co 4+ magnetic moment about 1.0 µ B and a magnetic energy of 0.12 eV/Co. The rehybridization process is also studied in the DFT+U point of view.

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Bulk electronic structure ofNa0.35CoO2⋅1.3H

Cited by 55 publications

References 39 publications

Evolution of electron Fermi surface with doping in cobaltates

Evolution of electron Fermi surface with doping in cobaltates

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Geometrical, electronic, and magnetic properties ofNa0.5CoO2from first principles

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Bulk electronic structure ofNa0.35CoO2⋅1.3H

Cited by 55 publications

References 39 publications

Evolution of electron Fermi surface with doping in cobaltates

Evolution of electron Fermi surface with doping in cobaltates

Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Geometrical, electronic, and magnetic properties ofNa0.5CoO2from first principles

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Product

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Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy