Diffraction streaks from the chimney ladder structure in an (Sr1.5Ca1.5)Cu5+δOy crystal

Wu, Xiaocui; Takayama‐Muromachi, E.; Suehara, Shigeru; Horiuchi, Shigeo

doi:10.1107/s0108767391006591

Cited by 16 publications

(4 citation statements)

References 5 publications

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“…For example, spot A can be produced by (004) L + (102) C , spot B by (002) L + (102) C . The diffraction streaks observed in EDP are due to the initial phase disorder in the structure [15].…”

Section: Methodsmentioning

confidence: 99%

Structural transition, electrical and magnetic properties of the B-site Co doped Sr₁₄Cu₂₄O₄₁compounds

Wang¹,

Lin²,

H³

et al. 2009

J. Phys.: Condens. Matter

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The effect of Co substitution for Cu on the structure and physical properties of Sr(14)(Cu(1-x)Co(x))(24)O(41) compounds was studied by analyzing the selected-area electron diffraction and convergent-beam electron diffraction patterns, and by measuring the magnetic susceptibility, the electrical resistivity and Raman spectra. It is found that the space group of the CuO(2) chain is changed from Amma to Ammm upon Co doping, but the structure of the Cu(2)O(3) ladder remains unchanged. This indicates that the displacement between two neighboring CuO(2) chains has disappeared due to Co doping. Once a small amount of Co ions are doped into the compound, exceptional changes in the Weiss temperature and in the number of dimers occur. The remarkable increase in the absolute value of the Weiss temperature indicates that the antiferromagnetic interaction in CuO(2) chains becomes very strong due to Co doping. The increase in the Curie coefficient and the number of dimers implies that the Co doping causes Zhang-Rice singlets in the chains to be decoupled into free spins Cu(2+) and holes. Then, the free spins Cu(2+) are coupled into dimers, and the holes transfer from chains to ladders, which causes the resistivity to decrease when the Co dopant concentration is low (x<0.10). When the Co dopant concentration is high (x>0.10), some Co ions are directly substituted for the Cu ions in the ladders, which results in an increase in resistivity with increasing Co dopant content.

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Section: Methodsmentioning

confidence: 99%

Structural transition, electrical and magnetic properties of the B-site Co doped Sr₁₄Cu₂₄O₄₁compounds

Wang¹,

Lin²,

H³

et al. 2009

J. Phys.: Condens. Matter

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“…Electron microscopy methods, such as electron diffraction and high-resolution image, can provide complementary information on local structures. In particular, for the incommensurate composite crystal, it will be easier to obtain the lattice mismatch using the electron diffraction method [13]. In a [1 10] zone axis electron diffraction pattern (EDP) for the sample with x = 6.0, as shown in figure 5(i), there are a lot of interesting spots in the picture.…”

Section: Electron Diffraction Analysismentioning

confidence: 99%

Microscopic evidence of dimer breaking up in CuO₂chain for Ca-substituted Sr₁₄Cu₂₄O₄₁compounds

Wang¹,

H²,

Guo³

et al. 2007

J. Phys.: Condens. Matter

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In this work we measured the temperature dependence of the static magnetic susceptibility for Ca-doped Sr14Cu24O41 compounds, studied the lattice mismatch between a CuO2 chain and a Cu2O3 ladder by using electron diffraction, and found that the magnetic properties and lattice mismatch were sensitive to the Ca content. Applying a modified ‘cut and projection’ method, it is found that the lattice mismatch induces the dimers in spin chains to be decoupled into free spin Cu2+. Further more, Ca doping makes lattice mismatch larger and more dimers decoupled. The number of dimerized spins and the number of free spins predicted by this method are in good agreement with those obtained by fitting the experimental static susceptibility data. This explanation can be applied not only to the Ca doping cases, but also to the case of oxygen nonstoichiometry.

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“…The observed diffused scattering and the mentioned above deficit in the A positions strongly suggest the existence of structural defects. For the interpretation of diffuse scattering, the "initial phase disorder" model of the chain/ladder structure by Wu et al [16] and the "pencil disorder" structural model by Milat et al [17] were developed. In both models, there is assumed that Cu-O chains are weakly spatially correlated.…”

Section: Discussionmentioning

confidence: 99%

“…The patterns were indexed according to the orthorhombic F222 (m/n = 5/7) structure [15]. No difference in electron diffraction patterns was observed for the samples prepared by the crushing and ion milling methods in contrast to results presented in [16]. The ratio of the c parameters for the ladder and chain sublattices was determined from the length of (0 0 10) and (0 0 14 Electron microscopy of the specimens with needle axis perpendicular to the surface showed the regions of perfect crystal structure.…”

Section: Amentioning

confidence: 94%

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr_4.1Ca_4.7Bi_0.3Cu₁₇O₂₉Single Crystals

et al. 2000

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Transmission electron microscopy and X-ray diffraction proved chain/ ladder incommensurate single crystal structure of investigated samples. The incommensurate ratio was determined from the X-ray and electron diffraction being equal to 0.704. Diffuse scattering intensities localised on the planes perpendicular to the c*-axis and passing through the spots originating from the periodicity of chain sublattice were detected. High-angle grain boundary or twinning formed by rotation of 33.3° around [100] direction was observed. High-resolution electron microscopy images revealed the stacking faults in ac planes.

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Diffraction streaks from the chimney ladder structure in an (Sr1.5Ca1.5)Cu5+δOy crystal

Cited by 16 publications

References 5 publications

Structural transition, electrical and magnetic properties of the B-site Co doped Sr₁₄Cu₂₄O₄₁compounds

Structural transition, electrical and magnetic properties of the B-site Co doped Sr₁₄Cu₂₄O₄₁compounds

Microscopic evidence of dimer breaking up in CuO₂chain for Ca-substituted Sr₁₄Cu₂₄O₄₁compounds

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr_4.1Ca_4.7Bi_0.3Cu₁₇O₂₉Single Crystals

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Diffraction streaks from the chimney ladder structure in an (Sr1.5Ca1.5)Cu5+δOy crystal

Cited by 16 publications

References 5 publications

Structural transition, electrical and magnetic properties of the B-site Co doped Sr14Cu24O41compounds

Structural transition, electrical and magnetic properties of the B-site Co doped Sr14Cu24O41compounds

Microscopic evidence of dimer breaking up in CuO2chain for Ca-substituted Sr14Cu24O41compounds

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr4.1Ca4.7Bi0.3Cu17O29Single Crystals

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Structural transition, electrical and magnetic properties of the B-site Co doped Sr₁₄Cu₂₄O₄₁compounds

Structural transition, electrical and magnetic properties of the B-site Co doped Sr₁₄Cu₂₄O₄₁compounds

Microscopic evidence of dimer breaking up in CuO₂chain for Ca-substituted Sr₁₄Cu₂₄O₄₁compounds

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr_4.1Ca_4.7Bi_0.3Cu₁₇O₂₉Single Crystals