Hts Logo

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: Non-Linear Microwave Surface Impedance of Patterned YBa2Cu3O7 Thin Films
Author(s): A. Porch, M.J. Lancaster, R.G. Humphreys, and N.G. Chew
Publication: Journal of Alloys and Compounds Volume: 195 Issue: Not Available Year: 1993 Page(s): 563-566
Editor(s): Not Available
Publisher: Elsevier Sequoia
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Surface Resistance

Materials and Properties

Y:123; [Y-Ba-Cu-O]
Material Specification for Y:123; [Y-Ba-Cu-O] Process: Evaporation
Notes: "The YBCO films are deposited by in situ coevaporation in an atomic oxygen atmosphere using an ultra high vacuum evaporator equipped with electron beam heated sources for each of the Y, Ba and Cu metals. The cation rates are controlled by a quadrupole mass spectrometer which gives high compositional accuracy. The substrates are polished (001)-oriented MgO single crystals. The resulting films are 350nm thick. The films are patterned by photolithography using a combination of argon ion beam milling and ethylene diamine tetra-acetic acid (EDTA) wet etching. After patterning the films are annealed at 500 °C in (0.1 MPa = 1 bar) of O2 to improve contact adhesion and to re-oxygenate the patterned edges."
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]
Critical Temperature (K)
89 ± 1
Measurement Method: Unknown Tc method

Cautions: Unevaluated Data
No measurement details were noted.
Surface Resistance for Y:123; [Y-Ba-Cu-O]
Resonator Frequency (GHz) Mode Number () Temperature (K) Surface Resistance (mΩ)
7.95 1 20 0.039
7.95 1 30 0.046
7.95 1 40 0.059
7.95 1 50 0.075
7.95 1 60 0.084
7.95 1 70 0.11
7.95 1 75 0.16
7.95 1 80 0.27
7.95 1 86 1.38
7.95 2 20 0.14
7.95 2 30 0.18
7.95 2 40 0.22
7.95 2 50 0.26
7.95 2 60 0.31
7.95 2 70 0.43
7.95 2 75 0.58
7.95 2 80 1.15
7.95 2 86 5.50
7.97 1 20 0.030
7.97 1 30 0.036
7.97 1 40 0.043
7.97 1 50 0.052
7.97 1 60 0.061
7.97 1 70 0.078
7.97 1 75 0.10
7.97 1 80 0.16
7.97 1 86 0.57
7.97 2 20 0.11
7.97 2 30 0.14
7.97 2 40 0.16
7.97 2 50 0.20
7.97 2 60 0.23
7.97 2 70 0.29
7.97 2 75 0.40
7.97 2 80 0.65
7.97 2 86 2.43
Measurement Method: Microwave resonator
"The standard resonator geometry... is chosen so that the lines have characteristic impedanaces of 50 Ω, with strip widths of 200 µm, line spacings of 73 µm and total line lengths of 8 mm... We package the resonators in a brass housing and capacitively couple microwave power into the ends of the resonators using K-connector pins; coupling gaps are typically around 300 µm long... The ground plane ends of the resonators are silvered and electrical contact to the housing is aided by a thin layer of indium. The package is mounted in a closed cycle cooler and the transmitted microwave response is measured using a Hewlett Packard 8720A network analyser with computer control. At low temperatures we obtain a dynamic range in excess of 60 dB for all of the modes presented in this paper."

Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.