Search

Presents a study which investigated the epitaxial growth of BaTiO[sub3] and SrTiO[sub3] films by the reactive evaporation method using reflection high-energy electron diffraction (RHEED). Experimental procedure; Details on the RHEED patterns of the surface of a SrTiO[sub3] substrate; Trace of specular beam intensity of RHEED during epitaxial growth of SrTiO[sub3].

Presents a study which performed the epitaxial growth and examined the dielectric properties of BaTiO[sub3] films on plutonium electrodes by reactive evaporation. Experimental details; Results and discussion; Conclusion.

Presents information on a study which examined the establishment of ultrathin yttrium barrium copper oxide epitaxial films in situ on strontium titanium oxide and magnesium oxide substrates by means of ozone-incorporating activated reactive evaporation. Methodology of the study; Results and discussion; Conclusions.

Ferroelectric BaTiO3 thin films were directly and epitaxially grown on SrTiO3 single crystal and epitaxial Pt film substrates by activated reactive evaporation. The substrate temperature was around 600 °C. For (100) oriented as-grown films, a typical ferroelectric hysteresis loop and a maximum of dielectric constant at about 115 °C were observed. The resistivity was as high as 109 Ω cm and the breakdown voltage was 2.7 MV/cm for as-grown BaTiO3 films. [ABSTRACT FROM AUTHOR]

Superconducting Nd-Ce-Cu-O thin films were epitaxially grown on SrTiO3 (100) by activated reactive evaporation. As-grown films showed the metallic temperature dependence of the resistivity and superconducting transition at 12.5 K (R=0). The remarkable parallel shift of the onset temperature of the resistive transition in the magnetic fields was observed. Ginzburg–Landau coherence lengths along the c axis and in the basal plane are 7 and 96 Å, respectively. [ABSTRACT FROM AUTHOR]

We have, for the first time, made quasi-particle tunneling measurements on a YBa2Cu3O7-x(001)/Y2O3 (001)/YBa2 Cu3 O7-x (001)junction, which was epitaxially grown on a MgO(100) substrate in an in-situ process. Both layers of YBa2 Cu3 O7-x showed the same superconducting transition of Tc end =86 K with ΔT(R=10–90%)=1.5 K. Quasi-particle tunneling in the direction perpendicular to the Cu-O planes was measured. A gap parameter Δ(4.5 K) of 9.0±0.2 meV and a value of 2Δ/kTc of 3.5+0.4-0.6 were obtained. [ABSTRACT FROM AUTHOR]

Normal-metal/insulator/superconductor (NIS) junctions were fabricated using thin films of YBa2Cu3O7-x (YBCO) or ErBa2Cu3O7-x. These were epitaxially grown on single-crystal SrTiO3 by the activated reactive evaporation method. For some NIS junctions prepared on SrTiO3 (110) substrates, we observed multipeaks in the differential conductance versus voltage curve. NIS junctions using single-crystal YBCO films on SrTiO3 (100) showed a set of peaks, from which we obtained a gap parameter of 11.5±1.5 meV at 4.4 K and a coupling constant of 3.2±0.4. [ABSTRACT FROM AUTHOR]

The orientation of YBa2Cu3O7-x thin films grown on (110) planes of SrTiO3 by activated reactive evaporation was investigated by means of reflection high-energy electron diffraction. The orientation of the films depended on the substrate temperature. The films with (110) planes parallel to the substrate surface grew in a narrow range of substrate temperatures around 530 °C, while the films with (103) planes parallel to the surface grew at temperatures above 600 °C. The change of the epitaxial orientation with the substrate temperature is discussed in terms of the temperature dependence of the lattice mismatch between YBa2Cu3O7-x and SrTiO3. [ABSTRACT FROM AUTHOR]

Presents corrections for the study 'Epitaxial Growth and Dielectric Properties of BaTiO[sub3] Films on Pt Electrodes by Reactive Evaporation,' by Y. Kano, K. Ijima, T. Terashima, Y. Bando, Y. Watanabe, H. Kasatani and H. Terauchi.

For cosmic microwave background (CMB) polarization observations, calibration of detector polarization angles is essential. We have developed a fully remote controlled calibration system with a sparse wire grid that reflects linearly polarized light along the wire direction. The new feature is a remote-controlled system for regular calibration, which has not been possible in sparse wire grid calibrators in past experiments. The remote control can be achieved by two electric linear actuators that load or unload the sparse wire grid into a position centered on the optical axis of a telescope between the calibration time and CMB observation. Furthermore, the sparse wire grid can be rotated by using a motor. A rotary encoder and a gravity sensor are installed on the sparse wire grid to monitor the wire direction. They allow us to achieve detector polarization angle calibration with an expected systematic error of 0.08°. The calibration system will be installed in small-aperture telescopes at Simons Observatory., (© 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).)