Twinning of YBa2Cu3O7 thin films on different substrates and modification by irradiation
Physica C. Bd. 220. H. 3/4. 1994 S. 219 - 226
Erscheinungsjahr: 1994
ISBN/ISSN: 0921-4534
Publikationstyp: Zeitschriftenaufsatz
Sprache: Englisch
Doi/URN: 10.1016/0921-4534(94)90906-7
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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 MO-CVD, sputtering techniques and laser ablation were examined with Co K? and synchroton radiation (?=0.56 Å, HASYLAB, Hamburg) using the q-scan technique at four circle diffractometers. One of the specimens was doped with Ni. The evaluation of positions and relative intensities of the splitted reflections shows a strong correlation between the structure of th...Bragg reflections of YBa2Cu3O7 (YBCO) films with c-axis orientation on (001) SrTiO3, (001) MgO and (110) NdGaO3 substrates prepared by MO-CVD, sputtering techniques and laser ablation were examined with Co K? and synchroton radiation (?=0.56 Å, HASYLAB, Hamburg) using the q-scan technique at four circle diffractometers. One of the specimens was doped with Ni. 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. Irradiation of the films on SrTiO3 substrate by heavy ions (1.2 GeV209Bi, 1.4 GeV238U, UNILAC, GSI Darmstadt) leads to a gradual parallel alignment of a,bs and a,bf (subscripts (s) denoting substrate, and (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
