Abstract
This report contains the result of an experimental and theoretical investigation of the oxygen ordering process in the High T{sub c} superconductor Y Ba{sub 2}Cu{sub 3}O{sub 6+x}. Neutron scattering is used in connection with in situ monitoring of the oxygen in-diffusion in a gas-volumetric equipment. Information on the variations of the structural phases, the twin domain sizes, the elastic forces, the chemical potential og oxygen as well as diffusion are provided. Using Monte Carlo simulations we find that a simple two-dimentional lattice gas model of the oxygen ordering process, the ASYNNNI model, gives an excellent description of the vast majority of these data. A systematic study of the relationship between the static and dynamic variations of the superconducting transition temperature, T{sub c}, and the corresponding variations of the low temperature oxygen ordering process is performed. Statistics from Monte Carlo simulations based on the ASYNNNI model are combined with experimental data from the literature. The combined static and dynamic analysis makes it evident that within a charge transfer model, a linear T{sub c} versus charge transfer relationship can only be rationalized if the description is based on extended coherent ordered domains and if the dynamic co-existence between the Ortho-I and the
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Citation Formats
Friis Poulsen, H.
Oxygen ordering and superconductivity in the high T{sub c} superconductor YBa{sub 2}Cu{sub 3}O{sub 6+x}.
Denmark: N. p.,
1991.
Web.
Friis Poulsen, H.
Oxygen ordering and superconductivity in the high T{sub c} superconductor YBa{sub 2}Cu{sub 3}O{sub 6+x}.
Denmark.
Friis Poulsen, H.
1991.
"Oxygen ordering and superconductivity in the high T{sub c} superconductor YBa{sub 2}Cu{sub 3}O{sub 6+x}."
Denmark.
@misc{etde_10145171,
title = {Oxygen ordering and superconductivity in the high T{sub c} superconductor YBa{sub 2}Cu{sub 3}O{sub 6+x}}
author = {Friis Poulsen, H}
abstractNote = {This report contains the result of an experimental and theoretical investigation of the oxygen ordering process in the High T{sub c} superconductor Y Ba{sub 2}Cu{sub 3}O{sub 6+x}. Neutron scattering is used in connection with in situ monitoring of the oxygen in-diffusion in a gas-volumetric equipment. Information on the variations of the structural phases, the twin domain sizes, the elastic forces, the chemical potential og oxygen as well as diffusion are provided. Using Monte Carlo simulations we find that a simple two-dimentional lattice gas model of the oxygen ordering process, the ASYNNNI model, gives an excellent description of the vast majority of these data. A systematic study of the relationship between the static and dynamic variations of the superconducting transition temperature, T{sub c}, and the corresponding variations of the low temperature oxygen ordering process is performed. Statistics from Monte Carlo simulations based on the ASYNNNI model are combined with experimental data from the literature. The combined static and dynamic analysis makes it evident that within a charge transfer model, a linear T{sub c} versus charge transfer relationship can only be rationalized if the description is based on extended coherent ordered domains and if the dynamic co-existence between the Ortho-I and the Ortho-II type of domains inherent to the ASYNNNI model is taken into account. A minimal model is proposed, where the total charge transfer is found as a weighted sum over the areas of the Ortho-I and the Ortho-II domains, and the minimal size of the two types of domains are given by a doubling og their unit cells in both directions. (au) 5 tabs., 35 ills., 108 refs.}
place = {Denmark}
year = {1991}
month = {Dec}
}
title = {Oxygen ordering and superconductivity in the high T{sub c} superconductor YBa{sub 2}Cu{sub 3}O{sub 6+x}}
author = {Friis Poulsen, H}
abstractNote = {This report contains the result of an experimental and theoretical investigation of the oxygen ordering process in the High T{sub c} superconductor Y Ba{sub 2}Cu{sub 3}O{sub 6+x}. Neutron scattering is used in connection with in situ monitoring of the oxygen in-diffusion in a gas-volumetric equipment. Information on the variations of the structural phases, the twin domain sizes, the elastic forces, the chemical potential og oxygen as well as diffusion are provided. Using Monte Carlo simulations we find that a simple two-dimentional lattice gas model of the oxygen ordering process, the ASYNNNI model, gives an excellent description of the vast majority of these data. A systematic study of the relationship between the static and dynamic variations of the superconducting transition temperature, T{sub c}, and the corresponding variations of the low temperature oxygen ordering process is performed. Statistics from Monte Carlo simulations based on the ASYNNNI model are combined with experimental data from the literature. The combined static and dynamic analysis makes it evident that within a charge transfer model, a linear T{sub c} versus charge transfer relationship can only be rationalized if the description is based on extended coherent ordered domains and if the dynamic co-existence between the Ortho-I and the Ortho-II type of domains inherent to the ASYNNNI model is taken into account. A minimal model is proposed, where the total charge transfer is found as a weighted sum over the areas of the Ortho-I and the Ortho-II domains, and the minimal size of the two types of domains are given by a doubling og their unit cells in both directions. (au) 5 tabs., 35 ills., 108 refs.}
place = {Denmark}
year = {1991}
month = {Dec}
}