Properties of the layered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BaCo</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mi mathva

Martinson, L. S.; Schweitzer, J. W.; Baenziger, N. C.

doi:10.1103/physrevb.54.11265

Cited by 23 publications

(28 citation statements)

References 12 publications

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“…With the increase of x, the lattice parameter c remains almost unchanged, while a decreases and is found to have a nonlinear dependence on x. 8 The two-dimensional nature of the structure influences the physical properties; for example, resistivity measurements on the single crystals exhibit 10 an anisotropy ratio of ϳ10 2 in the electrical resistivity within the ab plane and along the c axis. The resistivity at high temperatures for the insulating compositions shows 8 an activated behavior with E g ϳ0.14 eV for xϭ0; the gap decreases with increasing x, vanishing for xу0.2.…”

Section: Introductionmentioning

confidence: 97%

“…7 BaNiS 2 is a Pauli paramagnetic metal with a positive temperature coefficient of resistivity down to ϳ50 K; at lower temperatures it is nearly temperature independent. 8 The other end member of the solid solution, BaCoS 2 , is antiferromagnetic with a Néel temperature (T N )ϳ310 K and is in the Mott insulating state. 8 Ni substitution in BaCoS 2 drives the system into a paramagnetic metal beyond a critical concentration, x c Ӎ0.2.…”

Section: Introductionmentioning

confidence: 99%

“…8 The other end member of the solid solution, BaCoS 2 , is antiferromagnetic with a Néel temperature (T N )ϳ310 K and is in the Mott insulating state. 8 Ni substitution in BaCoS 2 drives the system into a paramagnetic metal beyond a critical concentration, x c Ӎ0.2. BaNiS 2 crystallizes in a tetragonal structure with a space group P4/nmm.…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure of and covalency driven metal-insulator transition in BaCo1-xNixS2

Krishnakumar

Saha-Dasgupta²,

Shanthi³

et al. 2001

Phys. Rev. B

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We investigate the evolution of the electronic structure across the metal-to-insulator transition in the isostructural series, BaCo 1Ϫx Ni x S 2 , using electron spectroscopic studies. Our experimental results show a progressive depletion of the spectral intensity at and near the Fermi level across the series, with decreasing x. Analysis of the core-level and valence-band photoemission spectra in conjunction with detailed many-body calculations show that the ground state of the system is highly covalent. We estimate the electronic structure parameters of the system and deduce that the hopping interaction strength t pd decreases in the solid solution with a decrease of the Ni content, while U dd and ⌬ do not change appreciably. Thus, the metal-to-insulator transition in this system is found to be driven primarily by covalency effects, though the static disorder in the system is expected to play an important role in determining the details of physical properties.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electronic structure of and covalency driven metal-insulator transition in BaCo1-xNixS2

Krishnakumar

Saha-Dasgupta²,

Shanthi³

et al. 2001

Phys. Rev. B

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“…The substitution of Mn> by a diamagnetic Zn> enables us to investigate the e!ect of the lanthanide ions on the magnetic properties of these sul"des. Moreover, the sul"des in which the Mn> ions are substituted by Co> ions can be expected to show interesting electrical and magnetic properties (4,5). In this paper, we report the preparation, crystal structures, and magnetic properties of a series of new quaternary sul"des, Ba¸n MS and BaNd MnS .…”

Section: Introductionmentioning

confidence: 98%

Crystal Structures and Magnetic Properties of New Quaternary Sulfides BaLn2MS5 (Ln=La, Ce, Pr, Nd; M=Co, Zn) and BaNd2MnS5

Wakeshima

Hinatsu

2001

Journal of Solid State Chemistry

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“…the metallic state and dT MI /dp < 0 fall in line with the Philips assumptions [2][3][4]. However, the model does not comment on the puzzling neutron diffraction result that the magnetic state appears to be random or at best short-range ordered in the metallic state [6] while there is antiferromagnetic order in the semiconducting state ( [7][8][9] and Fig. 2a).…”

Section: Introductionmentioning

confidence: 62%

Anomalous Metal-Insulator Transition in BaCo1?xNixS2?y as a Triggered Phase Transition

Poddar

Kang

Bärner

et al. 2001

phys. stat. sol. (b)

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Subject classification: 71.30.+h; 75.30.Kz; S8.16 The anomalous metal-insulator transition in BaCo 1--x Ni x S 2--y is identified as a triggered phase transition based on strong coupling between a magnetic and a structural order parameter. In particular, we observe a second-order paramagnetic-antiferromagnetic transition at T N followed by a first-order metal-insulator transition at T MI . The field-induced shifts of the sequential transition temperatures are determined for y ¼ 0.05: dT N /dB ¼ (--0.8 AE 0.2) K/T, and (--0.1 AE 0.1) K/T dT MI /dB (--0.5 AE 0.1) K/T.

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Properties of the layeredBaCo1−xNi

Cited by 23 publications

References 12 publications

Electronic structure of and covalency driven metal-insulator transition in BaCo1-xNixS2

Electronic structure of and covalency driven metal-insulator transition in BaCo1-xNixS2

Crystal Structures and Magnetic Properties of New Quaternary Sulfides BaLn2MS5 (Ln=La, Ce, Pr, Nd; M=Co, Zn) and BaNd2MnS5

Anomalous Metal-Insulator Transition in BaCo1?xNixS2?y as a Triggered Phase Transition

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