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NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Superconducting YBa2Cu3Ox Films Prepared by rf Plasma Flash Evaporation
Author(s): S. Yuhya, K. kikuchi, Y. Shiohara, K. Terashima, and T. Yoshida
Publication: Journal of Materials Research Volume: 7 Issue: 10 Year: 1992 Page(s): 2673-2679
Editor(s): Not Available
Publisher: Materials Research Society
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Current Density

Materials and Properties

Y:123; [Y-Ba-Cu-O]
Material Specification for Y:123; [Y-Ba-Cu-O] Process: Evaporation
Notes: "... we report... the preparation of... superconducting films by rf plasma flash evaporation... 4 MHz rf Ar-O2 plasma was operated at 43 kW and (26.7 kPa = 200 torr) as the input power of the plate power level and the total pressure, respectively. The Ar/O2 feeding ratio was 7/50. YBCO fine powder as raw material with about 3 µm in average size was fed axially into the plasma with Ar carrier gas. The powder was prepared by conventional solid phase reaction and subsequent pulverizing... An MgO(100) single crystal substrate (10 x 10 x 0.5 mm3) was placed on the stainless steel holder in a plasma tail. The holder and the substrate were spontaneously heated by the thermal plasma... The duration of the film growth that corresponded to the time for powder feeding was 10 min. After the growth, the sample was quickly cooled to room temperature under about (26.7 kPa = 200 torr) O2 atmosphere, taking about 10 min down to 200 °C. No post-deposition heat treatment was applied."
Formula: YBa2Cu3Ox
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Current Density for Y:123; [Y-Ba-Cu-O]
Powder Feed Rate (mg/min) Angle (H,n) (degrees) Temperature (K) Magnetic Field (T) Critical Current Density (kA/cm2)
0.95 90 4.2 0 782
0.95 90 4.2 1 668
0.95 90 4.2 2 619
0.95 90 4.2 4 627
0.95 90 4.2 6 586
0.95 90 77.3 0 85
0.95 90 77.3 0.3 44
0.95 90 77.3 0.6 34
0.95 90 77.3 1 25
0.95 90 77.3 2 14
0.95 90 77.3 4 9
0.95 90 77.3 6 5
0.95 0 4.2 0.2 562
0.95 0 4.2 0.3 477
0.95 0 4.2 0.6 439
0.95 0 4.2 1 405
0.95 0 4.2 2 373
0.95 0 4.2 4 316
0.95 0 4.2 6 291
0.95 0 77.3 0 44
0.95 0 77.3 0.2 27
0.95 0 77.3 0.6 11
0.95 0 77.3 1 5
0.95 0 77.3 2 1
3.8 90 4.2 0 33
3.8 90 4.2 0.1 6
3.8 90 4.2 0.6 7
3.8 90 4.2 1 8
3.8 90 4.2 2 4
3.8 90 4.2 2 6
3.8 90 4.2 4 2
3.8 90 4.2 4 4
3.8 90 4.2 6 3
3.8 90 77.3 0 0.29
3.8 90 77.3 0 0.16
3.8 90 77.3 0.02 0.11
3.8 90 77.3 0.02 0.06
3.8 90 77.3 0.05 0.02
3.8 0 4.2 0 9.2
3.8 0 4.2 0.2 4.4
3.8 0 4.2 0.5 3.2
3.8 0 4.2 1 5.1
3.8 0 4.2 1 2.4
3.8 0 4.2 2 3.4
3.8 0 4.2 2 1.9
3.8 0 4.2 4 1.9
3.8 0 4.2 6 1.6
3.8 0 77.3 0 0.23
3.8 0 77.3 0 0.08
3.8 0 77.3 0.02 0.03
3.8 0 77.3 0.05 0.02
Measurement Method: Four-probe method
"The electrical resistivity and the critical current density (Jc) were measured by a conventional four-probe method. The sample width of about 1-2 mm prepared by cleaving was used for the measurement. Electrical contacts to the film were made by coating a gold layer with about 1000 σ by vacuum evaporation. The voltage contacts were separated by a distance of 2 mm. The current leads of copper leaf-spring were pressed to the gold layer with silver loaded pastes... the criterion of the zero resistance temperature (T-8 Ω•cm. For the measurement Jc, a pulsed current with 50 ms in duration was supplied to the sample and the induced voltage was detected by the high-speed voltmeter with integration time of 20 ms. The criterion of Jc was taken as an electrical field of 1 µV/cm. Magnetic fields up to 6 T were applied parallel and perpendicular to the film surface. The current to measure the Jc was always transported perpendicular to the magnetic fields."

Cautions: Evaluated Data
Angle(H,n) is the angle between the direction of the applied field (H) and the normal (n) to the surface. Angle(H,n) = 0 means H is perpendicular the surface. For Angle(H,n) = 90, H is parallel to the surface. Digitized data were obtained from Figure 8 of the paper.