Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ
Published diffuse X-ray scattering from the high-Tc superconductor HgBa2CuO4+δ has been reexamined with a view to developing a model that more satisfactorily accounts for the observed patterns. The present work agrees with the previous conclusion that the doping oxygen atoms form long and isolated i...
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International Union of Crystallography
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doaj-f9076392586142888f5b2632b6811c8f2020-11-24T23:32:26ZengInternational Union of CrystallographyIUCrJ2052-25252016-09-013530931810.1107/S2052252516010629yu5010Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δT. R. Welberry0D. J. Goossens1Research School of Chemistry, Australian National University, Canberra, ACT 2601, AustraliaResearch School of Chemistry, Australian National University, Canberra, ACT 2601, AustraliaPublished diffuse X-ray scattering from the high-Tc superconductor HgBa2CuO4+δ has been reexamined with a view to developing a model that more satisfactorily accounts for the observed patterns. The present work agrees with the previous conclusion that the doping oxygen atoms form long and isolated interstitial chains that run in both tetragonal directions. However, a distinctly different model is proposed for the accompanying displacement patterns of the atoms surrounding these linear defects. In this new model it is proposed that it is the correlated shifts of the Ba atoms along the length of the defect chains that are the primary source of the observed scattering, and that the variations of intensity in the generated diffuse streaks of scattering originate from lateral shifts of both Hg and Ba atoms away from defects. The new model yields diffraction patterns that are in much more convincing agreement with the observations than the original model.http://scripts.iucr.org/cgi-bin/paper?S2052252516010629high-Tc superconductorsHgBa2CuO4+δdiffuse X-ray scatteringimproved model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
T. R. Welberry D. J. Goossens |
spellingShingle |
T. R. Welberry D. J. Goossens Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ IUCrJ high-Tc superconductors HgBa2CuO4+δ diffuse X-ray scattering improved model |
author_facet |
T. R. Welberry D. J. Goossens |
author_sort |
T. R. Welberry |
title |
Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ |
title_short |
Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ |
title_full |
Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ |
title_fullStr |
Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ |
title_full_unstemmed |
Interpretation of diffuse scattering in the high-Tc superconductor HgBa2CuO4+δ |
title_sort |
interpretation of diffuse scattering in the high-tc superconductor hgba2cuo4+δ |
publisher |
International Union of Crystallography |
series |
IUCrJ |
issn |
2052-2525 |
publishDate |
2016-09-01 |
description |
Published diffuse X-ray scattering from the high-Tc superconductor HgBa2CuO4+δ has been reexamined with a view to developing a model that more satisfactorily accounts for the observed patterns. The present work agrees with the previous conclusion that the doping oxygen atoms form long and isolated interstitial chains that run in both tetragonal directions. However, a distinctly different model is proposed for the accompanying displacement patterns of the atoms surrounding these linear defects. In this new model it is proposed that it is the correlated shifts of the Ba atoms along the length of the defect chains that are the primary source of the observed scattering, and that the variations of intensity in the generated diffuse streaks of scattering originate from lateral shifts of both Hg and Ba atoms away from defects. The new model yields diffraction patterns that are in much more convincing agreement with the observations than the original model. |
topic |
high-Tc superconductors HgBa2CuO4+δ diffuse X-ray scattering improved model |
url |
http://scripts.iucr.org/cgi-bin/paper?S2052252516010629 |
work_keys_str_mv |
AT trwelberry interpretationofdiffusescatteringinthehightcsuperconductorhgba2cuo4d AT djgoossens interpretationofdiffusescatteringinthehightcsuperconductorhgba2cuo4d |
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