External modification of twinning in YBCO thin films on different substrates
Physica C. Bd. 235-240. 1994 S. 673 - 674
Erscheinungsjahr: 1994
Publikationstyp: Zeitschriftenaufsatz (Forschungsbericht)
Sprache: Englisch
Doi/URN: 10.1016/0921-4534(94)91560-1
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Inhaltszusammenfassung
Bragg reflections of YBa2Cu3O7 (YBCO) films with c-axis orientation on (001) SrTiO3, (001) MgO and (110) NdGaO3 substrates prepared by different techniques (MO-CVD, sputtering and laser ablation) were examined with CoK?- and synchroton radiation (?=0.56Å, HASYLAB, Hamburg) using the q-scan technique at four circle diffractometers. The evaluation of positions and relative intensities of the splitted reflections shows a strong correlation between the structure of the substrate surface and the t...Bragg reflections of YBa2Cu3O7 (YBCO) films with c-axis orientation on (001) SrTiO3, (001) MgO and (110) NdGaO3 substrates prepared by different techniques (MO-CVD, sputtering and laser ablation) were examined with CoK?- and synchroton radiation (?=0.56Å, HASYLAB, Hamburg) using the q-scan technique at four circle diffractometers. The evaluation of positions and relative intensities of the splitted reflections shows a strong correlation between the structure of the substrate surface and the twinning geometry of the YBCO layer. The influence of Fe doping on Cu(1) and changes of the oxygen content on the structure in the YBCO basalplane and the substrate/film orientation is analysed. Irradiation of YBCO films on SrTiO3, MgO, NdGaO3 substrate by heavy ions (1.2GeV209Bi, 1.4GeV238U, 0.95 (2.5)GeV197 Au UNILAC, GSI Darmstadt) produce detwinning and leads to a gradual parallel alignment of a,bs and a,bf (subscripts: s:substrate, f:film) which is completed for a dose between 1011 and 1012 particles/cm2. » weiterlesen» einklappen
Autoren
Klassifikation
DFG Fachgebiet:
Physik der kondensierten Materie
DDC Sachgruppe:
Physik
