Control of crystal orientation in YBCO thin films by an oxygen diffusion process

Uchiyama, Takeshi; Iguchi, Ienari

doi:10.1088/0953-2048/17/4/004

Cited by 3 publications

(1 citation statement)

References 24 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dependence of the transition width on oxygen content has been studied by some groups. For example, Ye and Nakamura [24] and Cogollo et al [25] ascribe the broad resistive transitions of the YBCO bolometers to the amount of oxygen deficiency and Uchiyama et al attribute it to nonuniformity of the oxygen content (7 À d) in the YBCO thin film [26]. We investigated the effect of precipitates on the superconducting transition width.…”

Section: Resultsmentioning

confidence: 98%

The superconducting transition width and illumination wavelength dependence of the response of MgO substrate YBCO transition edge bolometers

Öktem¹,

Bozbey²,

Avci³

et al. 2007

Physica C: Superconductivity

View full text Add to dashboard Cite

Dependence of the phase and magnitude of the response of MgO substrate YBa 2 Cu 3 O 7Àd (YBCO) transition edge bolometers to the near infrared radiation on the superconducting transition width is presented in this work. The bolometers were made of YBCO thin films of 200 nm thickness that were grown on single crystal MgO (1 0 0) substrates by DC inverted cylindrical magnetron sputtering. We have measured the responses of both large and small area devices with respect to the bias temperature and radiation modulation frequency. We have observed that the superconducting transition width has major effects on the response of the bolometers such as; on a dip of the phase of the response versus modulation frequency curve around 1 Hz, the rate of decrease of the magnitude of the response, and dependence of the phase of the response on temperature at mid-range modulation frequency. We have investigated a correlation between the superconducting transition width and the YBCO film surface morphology of the devices. In addition, the illumination wavelength dependence of the optical response of both wide and narrow transition width devices has been investigated. Here we present the analysis and the possible mechanisms that can affect the response of the bolometers at the superconducting transition region.

show abstract

Section: Resultsmentioning

confidence: 98%

The superconducting transition width and illumination wavelength dependence of the response of MgO substrate YBCO transition edge bolometers

Öktem¹,

Bozbey²,

Avci³

et al. 2007

Physica C: Superconductivity

View full text Add to dashboard Cite

show abstract

Epitaxial growth and characterization of (110)-oriented YBCO/PBCGO bilayer and YBCO/PBCGO/YBCO trilayer heterostructures

Kandel,

Arndt,

et al. 2024

Journal of Applied Physics

View full text Add to dashboard Cite

We have grown and characterized (110)-oriented YBa2Cu3O7−x (YBCO)/PrBa2(Cu0.8Ga0.2)3O7−x (PBCGO) bilayer and YBCO/PBCGO/YBCO trilayer heterostructures, which were deposited by pulsed laser deposition technique for the nanofabrication of (110)-oriented YBCO-based superconductor (S)/insulator (I)/superconductor (S) tunneling vertical geometry Josephson junction and other superconductor electronic devices. The structural properties of these heterostructures, investigated through various x-ray diffraction techniques (profile, x-ray reflectivity, pole figure, and reciprocal mapping), showed (110)-oriented epitaxial growth with a preferred c-axis-in-plane direction for all layers of the heterostructures. The atomic force microscopy measurement on the top surface of the heterostructures showed crack-free and pinhole-free, compact surface morphology with about a few nanometer root mean square roughness over the 5 × 5 μm2 region. The electrical resistivity measurements on the (110)-direction of the heterostructures showed superconducting critical temperature (Tc) values above 77 K and a very small proximity effect due to the interfacial contact of the superconducting YBCO layers with the PBCGO insulating layer. Raman spectroscopy measurements on the heterostructures showed the softening of the Ag-type Raman modes associated with the apical oxygen O(4) and O(2)-O(3)-in-phase vibrations compared to the stand-alone (110)-oriented PBCGO due to the residual stress and additional two Raman modes at ∼600 and ∼285 cm−1 frequencies due to the disorder at the Cu–O chain site of the PBCGO. The growth process and structural, electrical transport, and Raman spectroscopy characterization of (110)-oriented YBCO/PBCGO bilayer and YBCO/PBCGO/YBCO trilayer heterostructures are discussed in detail.

show abstract

Effect of ${\rm BaZrO}_{3}$ Dopants in (110)-Oriented ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{6+x}$ Thin Films

Huhtinen

Valimaki

Irjala

et al. 2009

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Control of crystal orientation in YBCO thin films by an oxygen diffusion process

Cited by 3 publications

References 24 publications

The superconducting transition width and illumination wavelength dependence of the response of MgO substrate YBCO transition edge bolometers

The superconducting transition width and illumination wavelength dependence of the response of MgO substrate YBCO transition edge bolometers

Epitaxial growth and characterization of (110)-oriented YBCO/PBCGO bilayer and YBCO/PBCGO/YBCO trilayer heterostructures

Effect of ${\rm BaZrO}_{3}$ Dopants in (110)-Oriented ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{6+x}$ Thin Films

Contact Info

Product

Resources

About