Neutron Diffraction Study of NiS<sub>2</sub>with Pyrite Structure

Miyadai, Tomonao; Takizawa, Kôichi; Nagata, Hideo; Ito, Hajime; Miyahara, Syôhei; Hirakawa, Kazuomi

doi:10.1143/jpsj.38.115

Cited by 57 publications

(24 citation statements)

References 15 publications

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“…The temperature dependence of the superlattice intensity ( Fig. 1a) scales linearly with the magnetic M2 neutron diffraction intensity 9 . The x-ray supperlattice and neutron M2 diffraction intensities scale quadratically with the superlattice displacement and also the magnetic moment, respectively.…”

Section: Antiferromagnetism At Ambient and High Pressuresmentioning

confidence: 89%

“…However, vacancies are responsible for the variable canting angle in an antiferromagnet 18 , as observed in the M2 phase of NiS 2 (Ref. [9,10]). …”

Section: Experimental Methodsmentioning

confidence: 98%

“…All can be subsumed by symmetry changes wrought by a structural phase transition 5 . The cubic pyrite crystal NiS 2 has long been recognized as a canonical Mott-Hubbard correlated insulator 2,[8][9][10][11][12][13] . Band structure calculations 11 put the sulfur 3p band and Ni t 2g band well below the half filled Ni e g band, pointing to on-site Coulomb repulsion as the source of the insulating energy gap E g , which lies in the range 1-10 meV (Ref.…”

Section: Introductionmentioning

confidence: 99%

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Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

et al. 2011

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We use synchrotron x-ray diffraction and electrical transport under pressure to probe both the magnetism and the structure of single crystal NiS2 across its Mott-Hubbard transition. In the insulator, the low-temperature antiferromagnetic order results from superexchange among correlated electrons and couples to a (1/2, 1/2, 1/2) superlattice distortion. Applying pressure suppresses the insulating state, but enhances the magnetism as the superexchange increases with decreasing lattice constant. By comparing our results under pressure to previous studies of doped crystals we show that this dependence of the magnetism on the lattice constant is consistent for both band broadening and band filling. In the high pressure metallic phase the lattice symmetry is reduced from cubic to monoclinic, pointing to the primary influence of charge correlations at the transition. There exists a wide regime of phase separation that may be a general characteristic of correlated quantum matter.

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Section: Antiferromagnetism At Ambient and High Pressuresmentioning

confidence: 89%

“…However, vacancies are responsible for the variable canting angle in an antiferromagnet 18 , as observed in the M2 phase of NiS 2 (Ref. [9,10]). …”

Section: Experimental Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

et al. 2011

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“…In this paper, we focus on the antiferromagnetic (AF) χ-SDW metals and insulators with ℓ S ℓ = 0 in materials and models with strong electron correlation and magnetic frustration. They have been discovered in charge transfer insulators NiS 2 [8][9][10][11], metallic γ-FeMn alloys [12][13][14][15] and related materials where the magnetic moments reside on the frustrated face-centered-cubic lattice. Neutron scattering observed noncoplanar AF order with 4-sublattices and 3-ordering wavevectors.…”

mentioning

confidence: 99%

Chiral Spin Density Wave Order on the Frustrated Honeycomb and Bilayer Triangle Lattice Hubbard Model at Half-Filling

et al. 2015

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We study the Hubbard model on the frustrated honeycomb lattice with nearest-neighbor t1 and second nearest-neighbor hopping t2, which is isomorphic to the bilayer triangle lattice, using the SU(2)-invariant slave boson theory. We show that the Coulomb interaction U induces antiferromagnetic (AF) chiral spin-density wave (χ-SDW) order in a wide range of κ = t2/t1 where both the two-sublattice AF order at small κ and the decoupled three-sublattice 120 • order at large κ are strongly frustrated, leading to three distinct phases with different anomalous Hall responses. We find a continuous transition from a χ-SDW semimetal with anomalous Hall effect to a topological chiral Chern insulator exhibiting quantum anomalous Hall effect, followed by a discontinuous transition to a χ-SDW insulator with zero total Chern number but anomalous ac Hall effect. The χ-SDW is likely a generic phase of strongly correlated and highly frustrated hexagonal lattice electrons.

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“…-and divalent metal ions, have been known to show interesting magnetic and transport properties. Among them, FeS2 is a nonmagnetic semiconductor with a band gap of Es 0.9 eV [20], and NiS2 is an antiferromagnetic semiconductor with Eg ≈ 0.3 eV [21] and TN 40 K [22]. The band gap of FeS2 is a direct consequence of the filled t 25 band of Fe 3d and can be well explained by the band theory.…”

Section: Application To Diluted and Concentrated Magnetic Semiconductorsmentioning

confidence: 91%

Photoemission Study of the Electronic Structure of Semiconducting Compounds

1999

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We review how the electronic structure of semiconducting compounds is revealed by photoemission spectroscopy. Angle-resolved photoemission spectroscopy is used to study band dispersions and the photon-energy dependence of spectral line shapes is utilized to study atomic orbital origins of the electronic states, namely, the partial density of states. We focus on recent development in the studies of diluted magnetic semiconductors as well as other magnetic semiconductors, in which interaction between the relatively localized transition-metal d states and the extended sp band states plays a key role in characterizing their unique magnetic, transport, and optical properties.

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Neutron Diffraction Study of NiS₂with Pyrite Structure

Cited by 57 publications

References 15 publications

Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

Chiral Spin Density Wave Order on the Frustrated Honeycomb and Bilayer Triangle Lattice Hubbard Model at Half-Filling

Photoemission Study of the Electronic Structure of Semiconducting Compounds

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Neutron Diffraction Study of NiS2with Pyrite Structure

Cited by 57 publications

References 15 publications

Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

Chiral Spin Density Wave Order on the Frustrated Honeycomb and Bilayer Triangle Lattice Hubbard Model at Half-Filling

Photoemission Study of the Electronic Structure of Semiconducting Compounds

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Neutron Diffraction Study of NiS₂with Pyrite Structure