6533b7d8fe1ef96bd12699a2
RESEARCH PRODUCT
Preparation, Characterisation and Dielectric Properties of YBa2Cu3O7-δ/ Insulator-Heterostructures
A. SchattkeB. SchienerAlois LoidlH. AdrianS. EckertCh. Schwansubject
010302 applied physicsDiffractionPermittivitySuperconductivityMaterials scienceCondensed matter physicsGeneral Physics and AstronomyMineralogyHeterojunctionInsulator (electricity)02 engineering and technologyDielectric021001 nanoscience & nanotechnology01 natural sciencesCapacitancechemistry.chemical_compoundchemistry[PHYS.HIST]Physics [physics]/Physics archives0103 physical sciencesStrontium titanate0210 nano-technologydescription
YBa 2 Cu 3 O 7-δ /insulator/Au-heterostructures on SrTiO 3 or LaAlO 3 substrates were prepared to study the properties of the materials SrTiO 3 , BaTiO 3 and Ceo 2 . X-ray diffraction measurements in Bragg-Brentano geometry show c-axis-oriented growth for the superconductor and the insulators SrTiO 3 and CeO 2 . Typical values for the rocking curve width of the different insulating films are between 0.4° and 0.8°. The highest breakdown fields are measured for the insulator SrTiO 3 with +37.5 kV/mm and -8.8 kV/mm. The permittivity for CeO 2 is independent of applied field and only weakly temperature dependent. This is in contrast to the perovskite type insulators, where the permittivity depends on temperature and field. The measured real- and imaginary parts of the dielectric constant differ as a function of frequency (20 Hz - 1 MHz) from the bulk-materials for all three insulators. This behaviour can be explained with a resistance in series and a conductance parallel to the capacitance.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-04-01 |