X-ray superstructure determination of ordered oxygen and Cu-displacements in a single domain of YBa2Cu3O6.35

Zeiske, Th.; Hohlwein, D.; Sonntag, R.; Kubanek, F.; Collin, G.

doi:10.1007/bf01323540

Cited by 41 publications

(4 citation statements)

References 16 publications

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“…This configuration splits the O͑4͒ site into two sites separated by Ϯ0.05 Å from the stoichiometric ͓no O͑1͒ vacancies͔ site. 16,17 Röhler 15 considers a similar situation when single O͑1͒ vacancies cause shifts in the O͑4͒ position both along the same chain and along neighboring chains. In this model a single O͑1͒ vacancy affects 12 O͑4͒ atoms.…”

Section: A Split O"4… Sitementioning

confidence: 99%

“…In fact, it has been suggested that the split distribution is actually due to ordered O͑1͒ vacancies, 15 as in the Ortho-II phase of YBCO. 16,17 Part of the ambiguity in the interpretation lies in the difficulty of the measurement itself. The most serious problems with the XAFS measurements are pointed out by Stern et al 9 In their attempt to confirm the measurements of Mustre de Leon et al, they tried several samples with various oxygen concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2Cu
Booth
¹
,
Bridges
²
,
Boyce
³

et al. 1996
Phys. Rev. B
69
3
18
0
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We have performed fluorescence x-ray-absorption fine-structure ͑XAFS͒ measurements from 20-200 K on a 5000-Å c-axis film of YBa 2 Cu 3 O 7Ϫ␦ ͑YBCO͒ on MgO (T c ϭ89 K͒ using photons polarized perpendicular to the film. The quality of the data is high out to 16 Å Ϫ1 . The data from 3-15.5 Å Ϫ1 were transformed into r space and fit to a sum of theoretical standards out to 4.0 Å. These data are compared to YBCO data from a single crystal and from a film on LaAlO 3 with the same T c . The main difference between the single crystal and the film data is that while the single-crystal data are well described by a two-site axial oxygen ͓O͑4͔͒ distribution, we see no evidence for such a distribution in either thin-film sample. We place an upper limit on the size of the axial oxygen distribution splitting for the film on MgO at ⌬ r Շ0.09 Å. Therefore, the magnitude of any possible splitting is not directly related to T c . Fits to the temperature-dependent data from the YBCO film on MgO indicate that all bonds show a smooth change of their broadening factor , except the Cu-O͑4͒ bonds, which show an increase in in the vicinity of T c , followed by a decrease of the same magnitude. Such a feature does not occur in diffraction measurements. Since XAFS measurements of include any correlation between the atoms in a given bond, we conclude that the O͑4͒ position becomes less correlated with the Cu positions near T c . Correlation measurements of these and several further near neighbors are also reported.

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Section: A Split O"4… Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2Cu
Booth
¹
,
Bridges
²
,
Boyce
³

et al. 1996
Phys. Rev. B
69
3
18
0
View full text Add to dashboard Cite

show abstract

“…The crystallography of has been thoroughly studied as a function of oxygen stoichiometry, 29,30 oxygen ordering 31,32 and temperature. 33,34 One of the first experiments that clearly showed an anomaly in the structure near were the ion channeling experiments of Sharma et al 35,36 In these experiments, ions channeled along the c-axes of single crystals of and showed a broader angular width below as the crystal axis is rotated, suggesting an ordering or correlation of the atomic displacements in the superconducting state.…”

Section: Differential Pair Distribution Functions Ofmentioning

confidence: 99%

Recent “Local” Structural Studies: Metallic Alloys, Superconductors and Proteins

Kwei

Louca

Billinge

et al. 2002

Local Structure From Diffraction

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“…1 for the ion labelling.) Experiments have revealed the possible existence of a number of stable ordered phases (Van Tendeloo et al 1987;Zeiske et al 1992). and these have been extensively modelled using phenomenological lattice-gas models (de Fontaine et al 1987;Aukrust et al 1990;Burdett 1992;Aligia et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Lattice Dynamics of YBa2Cu3O6+x (x = 0·25, 0·5, 0.75)

Yim¹,

Oitmaa²,

Elcombe³

1993

Aust. J. Phys.

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The lattice dynamics of YBa2Cu306+x with partially filled 0(4) sites is investigated using a supercell method. The model used is the lattice-dynamical shell model, which incorporates the short-range interactions and the long-range Coulomb potential as well as the polarisabilities of ions. Varying the oxygen content produces small changes throughout the spectrum of normal modes, as well as major changes in those modes with large 0(4) amplitudes. Selected phonon dispersion curves are presented, with emphasis on the variation of frequency with oxygen concentration. The nature of new modes, which appear with an increase in oxygen concentration, is investigated. The overall phonon density of states is also presented.

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X-ray superstructure determination of ordered oxygen and Cu-displacements in a single domain of YBa2Cu3O6.35

Cited by 41 publications

References 16 publications

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2Cu
Booth
¹
,
Bridges
²
,
Boyce
³

et al. 1996
Phys. Rev. B
69
3
18
0
View full text Add to dashboard Cite

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2Cu
Booth
¹
,
Bridges
²
,
Boyce
³

et al. 1996
Phys. Rev. B
69
3
18
0
View full text Add to dashboard Cite

Recent “Local” Structural Studies: Metallic Alloys, Superconductors and Proteins

Lattice Dynamics of YBa2Cu3O6+x (x = 0·25, 0·5, 0.75)

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X-ray superstructure determination of ordered oxygen and Cu-displacements in a single domain of YBa2Cu3O6.35

Cited by 41 publications

References 16 publications

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2CuBooth1, Bridges2, Boyce3 et al. 1996Phys. Rev. B693180View full textAdd to dashboardCite

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2CuBooth1, Bridges2, Boyce3 et al. 1996Phys. Rev. B693180View full textAdd to dashboardCite

Recent “Local” Structural Studies: Metallic Alloys, Superconductors and Proteins

Lattice Dynamics of YBa2Cu3O6+x (x = 0·25, 0·5, 0.75)

Contact Info

Product

Resources

About

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2Cu
Booth
¹
,
Bridges
²
,
Boyce
³

et al. 1996
Phys. Rev. B
69
3
18
0
View full text Add to dashboard Cite

Comparison of local structure measurements fromc-axis polarized XAFS between a film and a single crystal ofYBa2Cu
Booth
¹
,
Bridges
²
,
Boyce
³

et al. 1996
Phys. Rev. B
69
3
18
0
View full text Add to dashboard Cite