A2Cu2CoO2S2 (A = Sr, Ba), A Novel Example of a Square-Planar CoO2 Layer

Zhu, Wenjie; Hor, P. H.; Jacobson, Allan J.; Crisci, Gerardo; Albright, Thomas A.; Wang, S.-H.; Vogt, Thomas

doi:10.1021/ja972542v

Cited by 80 publications

(101 citation statements)

References 12 publications

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“…In fact, a similar compound, Sr 2 Mn 3 As 2 O 2 (2322), which contains alternating MnO 2 sheets and Mn 2 As 2 layers, was reported earlier in 1979 10 . Later in 1990s, a series of 2322-type materials were synthesized and characterized [11][12][13][14][15][16][17][18] , presumably due to the structural similarity with cuprate superconductors. Since the birth of high-temperature iron-based superconductors in 2008, there has been a renewed interest on studying the related systems 7,8,[19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2
Jiang
¹
,
Bao
²
,
Zhai
³

et al. 2015
Phys. Rev. B
31
7
53
0
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We report the physical properties and electronic structure calculations of a layered chromium oxypnictide, Sr2Cr3As2O2, which crystallizes in a Sr2Mn3As2O2-type structure containing both CrO2 planes and Cr2As2 layers. The newly synthesized material exhibits a metallic conduction with a dominant electron-magnon scattering. Magnetic and specific-heat measurements indicate at least two intrinsic magnetic transitions below room temperature. One is an antiferromagnetic transition at 291 K, probably associated with a spin ordering in the Cr2As2 layers. Another transition is broad, occurring at around 38 K, and possibly due to a short-range spin order in the CrO2 planes. Our first-principles calculations indicate predominant two-dimensional antiferromagnetic exchange couplings, and suggest a KG-type (i.e. K2NiF4 type for CrO2 planes and G type for Cr2As2 layers) magnetic structure, with reduced moments for both Cr sublattices. The corresponding electronic states near the Fermi energy are mostly contributed from Cr-3d orbitals which weakly (modestly) hybridize with the O-2p (As-4p) orbitals in the CrO2 (Cr2As2) layers. The bare bandstructure density of states at the Fermi level is only ∼1/4 of the experimental value derived from the lowtemperature specific-heat data, consistent with the remarkable electron-magnon coupling. The title compound is argued to be a possible candidate to host superconductivity.

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Section: Introductionmentioning

confidence: 99%

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2
Jiang
¹
,
Bao
²
,
Zhai
³

et al. 2015
Phys. Rev. B
31
7
53
0
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“…The structure of Sr 4 Sc 2 Fe 2 P 2 O 6 consists of the perovskite-realted Sr 2 ScO 3 layers and the Fe 2 P 2 layers, alternatively stacking up [17,18].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

et al. 2011

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Additional charge carriers were introduced to the iron oxyarsenide Sr 4 Sc 2 Fe 2 As 2 O 6 under a high-pressure condition, followed by measurements of electrical resistivity, Hall coefficient, and magnetic susceptibility. The host compound Sr 4 Sc 2 Fe 2 As 2 O 6 shows metallic conductivity down to ~200 K and turns to show a semiconducting-like conductivity accompanied by a positive magneto-resistance (22% at 70 kOe). Although the carrier density is comparable at 300 K (5.9×10 21 cm -3 ) with that of the other Fe-based superconductors, no superconductivity appears down to 2 K. This is primarily because the net carrier density decreases over 3 orders of magnitude on cooling and additionally a possible magnetic order at ~120 K prevents carriers from pairing. The properties were altered largely by introducing the additional carriers.

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“…From the viewpoint of materials design, we have studied the prototypical transition-metal hybrid material Sr 2 Cu 2 CoO 2 S 2 [1]. Layered cobalt oxysulfide Sr 2 Cu 2 CoO 2 S 2 crystallizes in an unusual intergrowth structure consisting of the CoO 2 square lattice and ThCr 2 Si 2 -type sulfide layers, as shown Figure 1.…”

mentioning

confidence: 99%

Dielectric responses of the layered cobalt oxysulfide Sr2Cu2CoO2S2 with CoO2 square planes

Okada

Terasaki

Ooyama

et al. 2004

Journal of Applied Physics

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We have studied the dielectric responses of the layered cobalt oxysulfide Sr2Cu2CoO2S2 with the CoO2 square-planes. With decreasing temperature below the Néel temperature, the resistivity increases like a semiconductor, and the thermopower decreases like a metal. The dielectric constant is highly dependent on temperature, and the dielectric relaxation is systematically changed with temperature, which is strongly correlated to the magnetic states. These behaviors suggest that carriers distributed homogeneously in the paramagnetic state at high temperatures are expelled from the antiferromagnetically ordered spin domain below the Néel temperature.

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A₂Cu₂CoO₂S₂ (A = Sr, Ba), A Novel Example of a Square-Planar CoO₂ Layer

Cited by 80 publications

References 12 publications

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2
Jiang
¹
,
Bao
²
,
Zhai
³

et al. 2015
Phys. Rev. B
31
7
53
0
View full text Add to dashboard Cite

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2
Jiang
¹
,
Bao
²
,
Zhai
³

et al. 2015
Phys. Rev. B
31
7
53
0
View full text Add to dashboard Cite

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

Dielectric responses of the layered cobalt oxysulfide Sr2Cu2CoO2S2 with CoO2 square planes

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A2Cu2CoO2S2 (A = Sr, Ba), A Novel Example of a Square-Planar CoO2 Layer

Cited by 80 publications

References 12 publications

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2Jiang1, Bao2, Zhai3 et al. 2015Phys. Rev. B317530View full textAdd to dashboardCite

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2Jiang1, Bao2, Zhai3 et al. 2015Phys. Rev. B317530View full textAdd to dashboardCite

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

Dielectric responses of the layered cobalt oxysulfide Sr2Cu2CoO2S2 with CoO2 square planes

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A₂Cu₂CoO₂S₂ (A = Sr, Ba), A Novel Example of a Square-Planar CoO₂ Layer

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2
Jiang
¹
,
Bao
²
,
Zhai
³

et al. 2015
Phys. Rev. B
31
7
53
0
View full text Add to dashboard Cite

Physical properties and electronic structure ofSr2Cr3As2O2containingCrO2
Jiang
¹
,
Bao
²
,
Zhai
³

et al. 2015
Phys. Rev. B
31
7
53
0
View full text Add to dashboard Cite