The structure of the ortho-III phase of YBa2Cu3O6+x by X-ray scattering

Stratilatov, A.; Plakhty, V.P.; Chernenkov, Yu. P.; Федоров, В. В.

doi:10.1016/0375-9601(93)90508-w

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…Its structural order drives the whole crystal structure in a variety of superstructures which have been observed [1][2][3][4][5][6][7][8] and modeled theoretically [9][10][11][12][13] in the whole compositional x-range. Beside the tetragonal (T, empty chain) and orthorhombic-I (OI, full chain) structures that characterize the end members of the compositional x-range (x=0 and 1 respectively), at least two orthorhombic modifications, ortho-II (OII) and ortho-III (OIII), occurring around the ideal x=0.5 and x=0.67 compositions and characterized by a ...-full-empty-.. and a ...-full-full-empty-... chain sequence along the a direction, are considered thermodynamically stable 8,9 .…”

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Critical chain length and superconductivity emergence in oxygen-equalized pairs ofYBa2Cu3O<

et al. 2000

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The oxygen-order dependent emergence of superconductivity in YBa 2 Cu 3 O 6+x is studied, for the first time in a comparative way, on pair samples having the same oxygen content and thermal history, but different Cu(1)O x chain arrangements deriving from their intercalated and deintercalated nature. Structural and electronic non-equivalence of pairs samples is detected in the critical region and found to be related, on microscopic scale, to a different average chain length, which, on being experimentally determined by nuclear quadrupole resonance (NQR), sheds new light on the concept of critical chain length for hole doping efficiency.74.25.Dw; 61.14. x; 76.60.Gv;Typeset using REVT E X 1

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confidence: 99%

Critical chain length and superconductivity emergence in oxygen-equalized pairs ofYBa2Cu3O<

et al. 2000

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“…The fundamental unit cell is orthorhombic, with a dimension of 2a × b × c. Other oxygen-ordering models of basal planes (Cu-O) of the YBa 2 Cu 3 O 7-x are also proposed as shown in Figure 22B, which depends on the oxygen content. These phases would correspond to the ortho-II phase and ortho-III phases [90][91][92][93][94][95][96], which results in the changes of Tc, and the control of oxygen atoms in the oxide crystals is important [97][98][99]. Table 9 Summary of modulated structures of YBa 2 Cu 3 O y .…”

Section: Oxygen Ordering In Yba 2 Cu 3 O 7-xmentioning

confidence: 99%

High-resolution electron microscopy and electron diffraction of perovskite-type superconducting copper oxides

Oku

2014

Nanotechnology Reviews

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High-resolution electron microscopy and electron diffraction are quite useful for structural characterization of perovskite-type superconducting copper oxides on the atomic scale. Valuable information on the crystal structures and the microstructures could be obtained from observed high-resolution images if severe conditions such as thinner crystals and definite defocus values are satisfied. The structure images and electron diffraction patterns include information not only on accurate atomic coordinates of cations but also on ordered arrangements of oxygen atoms and oxygen vacancies. Crystal structures of the various perovskite-type copper oxides were analyzed from the observed structure images. Modulated structures, defects, intergowth, surfaces, and interfaces were also investigated.

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“…[2][3][4][5][6][7] The simplest of these intermediates is the Ortho II phase with ␦ = 0.5. The atomic structures and stability of many of these phases have been examined, experimentally, by neutron and x-ray diffraction [8][9][10][11][12][13][14][15][16][17][18] and, theoretically, by density functional theory 7,19 and cluster-expansion calculations. [20][21][22][23] The dominant microstructural feature in YBCO is twinning.…”

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Structural inhomogeneity and twinning inYBa2Cu3O7−δsuperconductors: High-resolution transmission electron microscopy me

2008

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The superconducting properties of YBa 2 Cu 3 O 7-␦ ͑YBCO͒ are strongly dependent on atomic structure and composition. While the average structures of YBCO are well documented, the local oxygen concentration and ordering have received much less attention owing to the difficulty of experiments and analysis. We examined several samples of YBCO by quantitative high-resolution transmission electron microscopy and geometric phase analysis to determine their local atomic structure and symmetry. Our results reveal that adjacent domains separated by the ͑110͒ interfaces, commonly considered to be twin domains, can have different a o / b o ratios. The domains, therefore, do not retain the ideal twinned configuration commonly expected for this system. Assuming the a o / b o ratio is proportional to oxygen concentration, we suggest that these domains result from inhomogeneous oxygen distribution. Multiple measurements in both bulk and thin-film samples indicate that YBCO can consist of different phases, which may yield locally variable superconducting properties.

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The structure of the ortho-III phase of YBa2Cu3O6+x by X-ray scattering

Cited by 21 publications

References 7 publications

Critical chain length and superconductivity emergence in oxygen-equalized pairs ofYBa2Cu3O<

Critical chain length and superconductivity emergence in oxygen-equalized pairs ofYBa2Cu3O<

High-resolution electron microscopy and electron diffraction of perovskite-type superconducting copper oxides

Structural inhomogeneity and twinning inYBa2Cu3O7−δsuperconductors: High-resolution transmission electron microscopy me

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