Abstract
Crystallographic changes as a result of heat-treatment at 700-900 deg. C are found for SrTiO{sub 3}(100), MgO(100) and LaAlO{sub 3}(100). The p(2x2) reconstruction of the SrTiO{sub 3}(100) and the superstructures on MgO(100) and on LaAlO{sub 3}(100) thus observed are suggested to be induced by segregation of impurities to the surface. The surface charge-effects which disturb electron- and photon-impact experiments with these insulators are removed by heat-treatments. Deposition of copper results in formation of copper islands on SrTiO{sub 3}(100) and on LaAlO{sub 3}(100). Yttrium forms islands on LaAlO{sub 3}(100) and grows in a layer-by-layer mode on SrTiO{sub 3}(100) and on MgO(100). An yttrium 1x1 epitaxy is observed on the MgO(100) surface, which is suggested to be an YO superstructure. Oxidation of the 1x1 Y/MgO(100) systems diminishes the charge-effects and improves all diffraction and spectroscopic measurements. This may be due to the formation of metallic states around the Fermi level when the film is oxidized. An in situ synthesized YBa{sub 2}Cu{sub 3}O{sub 7} thin film on SrTiO{sub 3}(100) compared to a thick epitaxial YBa{sub 2}Cu{sub 3}O{sub 7-x}(001) film on MgO(100) reveals differences in surface electronic structures but not in surface stoichiometries. (au) 18 refs.
Citation Formats
Enevold Thaulov Andersen, J.
Surface studies of YBa{sub 2}Cu{sub 3}O{sub 7-x} -matching oxide substrates and interfaces.
Denmark: N. p.,
1990.
Web.
Enevold Thaulov Andersen, J.
Surface studies of YBa{sub 2}Cu{sub 3}O{sub 7-x} -matching oxide substrates and interfaces.
Denmark.
Enevold Thaulov Andersen, J.
1990.
"Surface studies of YBa{sub 2}Cu{sub 3}O{sub 7-x} -matching oxide substrates and interfaces."
Denmark.
@misc{etde_10142372,
title = {Surface studies of YBa{sub 2}Cu{sub 3}O{sub 7-x} -matching oxide substrates and interfaces}
author = {Enevold Thaulov Andersen, J}
abstractNote = {Crystallographic changes as a result of heat-treatment at 700-900 deg. C are found for SrTiO{sub 3}(100), MgO(100) and LaAlO{sub 3}(100). The p(2x2) reconstruction of the SrTiO{sub 3}(100) and the superstructures on MgO(100) and on LaAlO{sub 3}(100) thus observed are suggested to be induced by segregation of impurities to the surface. The surface charge-effects which disturb electron- and photon-impact experiments with these insulators are removed by heat-treatments. Deposition of copper results in formation of copper islands on SrTiO{sub 3}(100) and on LaAlO{sub 3}(100). Yttrium forms islands on LaAlO{sub 3}(100) and grows in a layer-by-layer mode on SrTiO{sub 3}(100) and on MgO(100). An yttrium 1x1 epitaxy is observed on the MgO(100) surface, which is suggested to be an YO superstructure. Oxidation of the 1x1 Y/MgO(100) systems diminishes the charge-effects and improves all diffraction and spectroscopic measurements. This may be due to the formation of metallic states around the Fermi level when the film is oxidized. An in situ synthesized YBa{sub 2}Cu{sub 3}O{sub 7} thin film on SrTiO{sub 3}(100) compared to a thick epitaxial YBa{sub 2}Cu{sub 3}O{sub 7-x}(001) film on MgO(100) reveals differences in surface electronic structures but not in surface stoichiometries. (au) 18 refs.}
place = {Denmark}
year = {1990}
month = {Nov}
}
title = {Surface studies of YBa{sub 2}Cu{sub 3}O{sub 7-x} -matching oxide substrates and interfaces}
author = {Enevold Thaulov Andersen, J}
abstractNote = {Crystallographic changes as a result of heat-treatment at 700-900 deg. C are found for SrTiO{sub 3}(100), MgO(100) and LaAlO{sub 3}(100). The p(2x2) reconstruction of the SrTiO{sub 3}(100) and the superstructures on MgO(100) and on LaAlO{sub 3}(100) thus observed are suggested to be induced by segregation of impurities to the surface. The surface charge-effects which disturb electron- and photon-impact experiments with these insulators are removed by heat-treatments. Deposition of copper results in formation of copper islands on SrTiO{sub 3}(100) and on LaAlO{sub 3}(100). Yttrium forms islands on LaAlO{sub 3}(100) and grows in a layer-by-layer mode on SrTiO{sub 3}(100) and on MgO(100). An yttrium 1x1 epitaxy is observed on the MgO(100) surface, which is suggested to be an YO superstructure. Oxidation of the 1x1 Y/MgO(100) systems diminishes the charge-effects and improves all diffraction and spectroscopic measurements. This may be due to the formation of metallic states around the Fermi level when the film is oxidized. An in situ synthesized YBa{sub 2}Cu{sub 3}O{sub 7} thin film on SrTiO{sub 3}(100) compared to a thick epitaxial YBa{sub 2}Cu{sub 3}O{sub 7-x}(001) film on MgO(100) reveals differences in surface electronic structures but not in surface stoichiometries. (au) 18 refs.}
place = {Denmark}
year = {1990}
month = {Nov}
}