Surface resistance of YBa sub 2 Cu sub 3 O sub 7 films on SrTiO sub 3 and LaGaO sub 3 substrates

Journal Article · Mon Aug 28 00:00:00 EDT 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.101621· OSTI ID:5555702

Cooke, D W; Gray, E R; Houlton, R J; Rusnak, B; Meyer, E A; Beery, J G; Brown, D R; Garzon, F H; Raistrick, I D; Rollet, A D; others, and

Surface resistance measurements of films of YBa{sub 2}Cu{sub 3}O{sub 7} deposited onto single-crystal substrates of LaGaO{sub 3} and SrTiO{sub 3} have been made at a frequency of 22 GHz. The measurements were made in either a copper or niobium cavity by replacing the end wall with the superconducting film. Typical surface resistance at 20 K are 1--2 m{Omega} for films on LaGaO{sub 3} and 6--8 m{Omega} for films on SrTiO{sub 3}, as measured in the copper cavity. The LaGaO{sub 3} values lie within the sensitivity range of the Cu cavity ({similar to}2 m{Omega}) and can only be considered upper limits. Similar measurements in a Nb superconducting cavity resulted in a surface resistance value of 0.2{plus minus}0.1 m{Omega} at 4 K for the best LaGaO{sub 3}-based film. This value is more than an order of magnitude lower than Cu, and suggests that LaGaO{sub 3}-based films may offer immediate advantages in a number of applications.

• OSTI ID: 5555702
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 55:9; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CAVITIES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FILMS
FREQUENCY RANGE
GALLIUM COMPOUNDS
GALLIUM OXIDES
GHZ RANGE
GHZ RANGE 01-100
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MICROWAVE RADIATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES