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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: Comparison of Ba2YCu3O7-δ Thin Films Grown on Various Perovskite Substrates by Coevaporation
Author(s): J.M. Phillips, M.P. Siegal, R.B. van Dover, T.H. Tiefel, J.H. Marshall, A.J. Strauss, R.E. Fahey, S. Sengupta et al.
Publication: Journal of Materials Research Volume: 7 Issue: 10 Year: 1992 Page(s): 2650-2657
Editor(s): Not Available
Publisher: Materials Research Society
Language: English
Notes: et al. = A. Cassanho and H.P. Jenssen
Keywords: Material Specification, Critical Temperature, Critical Current Density

Materials and Properties

Y:123; [Y-Ba-Cu-O]
Material Specification for Y:123; [Y-Ba-Cu-O] Process: Evaporation
Notes: The authors cite M.P. Siegal et al., Physica C, Vol. 172, 282 (1990), and summarize the procedure as follows. "Substrates are cleaned ultrasonically in hot Alconox (15 min), hot trichloroethylene (30 min), room temperature acetone (15 min), and room temperature de-ionized water (15 min) and dried with N2 gas. In some cases, La-containing and SrTiO3 substrates are then annealed at 860 °C in flowing O2 for 30 min, while the Nd-containing and LiBaF3 substrates are not annealed. Films 100 nm thick are grown by coevaporating BaF2, Y, and Cu onto the unheated (100) oriented substrate(s) of choice... After deposition the films are annealed by a two-stage process. During the first part of the anneal, the oxygen is bubbled through room temperature water to facilitate the hydrolysis of the BaF2 in the precursor films and promote the formation of the... tetragonal phase. After 30 min, the temperature is lowered gradually to 525 °C... Dry oxygen is used for the remainder of the anneal, which consists of 30 min at 525 °C, followed by gradual cooling to room temperature."
Formula: YBa2Cu3O7-x
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: Thin Film

Critical Temperature for Y:123; [Y-Ba-Cu-O]
Substrate () Annealing Temperature (°C) Critical Temperature (K)
NdGaO3 825 89.1
NdAlO3 875 89.7
LaGaO3 875 89.7
LaAlO3 850 91.7
SrTiO3 925 90.3
Measurement Method: Four-probe method
"To measure the transition temperature Tc, four Au leads are soldered with In to a sample surface... The critical current density... Jc has also been measured directly from I-V curves. For low current densities...a dc current staircase was used, with Jc defined using a field criterion of... 1 µV/cm. At higher current densities a low-duty-cycle trapezoidal current pulse was applied to eliminate heating; typically we employ a 1% duty cycle pulse with 0.1 ms rise and fall times and 1 ms flat top..."

Cautions: Evaluated Data
Critical Current Density for Y:123; [Y-Ba-Cu-O]
Substrate () Annealing Temperature (°C) Critical Current Density (kA/cm2)
NdGaO3 825 1
NdAlO3 875 30
LaGaO3 875 300
LaAlO3 850 1000
SrTiO3 925 1200
Measurement Method: Four-probe method
"To measure the transition temperature Tc, four Au leads are soldered with In to a sample surface... The critical current density... Jc has also been measured directly from I-V curves. For low current densities...a dc current staircase was used, with Jc defined using a field criterion of... 1 µV/cm. At higher current densities a low-duty-cycle trapezoidal current pulse was applied to eliminate heating; typically we employ a 1% duty cycle pulse with 0.1 ms rise and fall times and 1 ms flat top..."

Cautions: Evaluated Data