Antiferromagnetism, structural properties, and electronic transport of<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>0.9</mml:mn></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:mn>0.1</mml:mn></mml:mrow></mml:msub></m

Mentink, S.A.M.; Mason, T.E.; Fisher, B.; Genossar, J.; Patlagan, L.; Kanigel, Amit; Lumsden, M. D.; Gaulin, B. D.

doi:10.1103/physrevb.55.12375

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…A similar magnetic structure was found by neutron powder diffraction in BaCo 0.9 Ni 0.1 S 1.8 in the AFM state ͑at temperatures above the M-I transition͒. 7 Substitution of Co by Ni in the stoichiometric material produces a gradual change with composition from a nonmetallic ͑NM͒ antiferromagnet ͑at low temperature͒ to a metallic ͑M͒ paramagnet, 1,4,5 with a crossover from NM-AFM to M-PM behavior near x(Ni)ϭ0. 25.…”

Section: Introductionsupporting

confidence: 68%

Electronic transport and antiferromagnetism in the layered compoundBaCoS2

Fisher¹,

Genossar²,

Patlagan³

et al. 1999

Phys. Rev. B

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BaCoS 2 is a Mott insulator with a Neél temperature (T N ) close to room temperature. In the ordered antiferromagnetic phase, the magnetic moments are confined in the Co 2 S 2 planes, and arranged in alternatingly directed ferromagnetic chains. We report on resistivity and thermopower measurements and on roomtemperature cell constants of samples of BaCoS z with nominal sulfur content 1.9рzр2.1. We discuss the effect of sulfur content on cell constants and band filling. The main observation is a crossover from activated electronic transport at high temperatures, to high resistivity almost independent of temperature, and accompanied by a vanishingly small thermopower, at low temperatures ͑far below T N ͒. We interpret the transport mechanism in the low-temperature regime as tunneling in the Co 2 S 2 planes, to nearest neighbors along the ferromagnetic chains and to next-nearest neighbors in the perpendicular direction, or alternatively to nearest neighbors along the ferromagnetic chains with conducting inclusions acting as shorts.

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Section: Introductionsupporting

confidence: 68%

Electronic transport and antiferromagnetism in the layered compoundBaCoS2

Fisher¹,

Genossar²,

Patlagan³

et al. 1999

Phys. Rev. B

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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: 61%

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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“…Unfortunately there has been no explanation for these apparently contradictory results for the spin configuration of Co 2+ in BaCoS 2 . Adding to the confusion are neutron powder diffraction data 6,14,20 for BaCo 1−x Ni x S 2 with 0.1ഛ x ഛ 0.2 that give ordered Co moments near 1.8 B .…”

Section: Discussionmentioning

confidence: 99%

Structural, electrical, and magnetic properties ofBaCo1−xCuxS2

Schweitzer

2006

Phys. Rev. B

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Compounds of the layered transition-metal-sulfide series BaCo 1−x Cu x S 2 ͑0 ഛ x ഛ 0.5͒ were prepared, and structural, electrical, and magnetic properties were investigated. The semiconductor BaCoS 2 is antiferromagnetically ordered below 310 K. With increasing Cu content x the structure becomes more anisotropic as the lattice parameter perpendicular to the layers elongates while the parallel parameter contracts. The resistivity is nonmetallic for all the compounds in this series. The Néel temperature T N decreases with x, reaching T N Ϸ 0 by x Ϸ 0.2. The susceptibility in the high-temperature paramagnetic phase, which for BaCoS 2 is consistent with Co 2+ ions in the low-spin S =1/2 state, shows a Curie constant that is very much smaller than expected for Cu 1+ and a mixture of Co 2+ and Co 3+ in the ratio of 1 -2x to x. At sufficiently low temperatures there is a spin-glass phase for all x Ͼ 0. The magnetic phase diagram obtained is remarkably similar to that of normal state La 2−x Sr x CuO 4 ͑x ഛ 0.06͒.

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Antiferromagnetism, structural properties, and electronic transport ofBaCo0.9Ni0.1

Cited by 14 publications

References 12 publications

Electronic transport and antiferromagnetism in the layered compoundBaCoS2

Electronic transport and antiferromagnetism in the layered compoundBaCoS2

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

Structural, electrical, and magnetic properties ofBaCo1−xCuxS2

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