YBCO/IBAD/Inconel coated conductor with end-to-end critical current of 96 A at 75 K Los Alamos Materials Science and Technology STC: Superconductivity.

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Presentation transcript:

YBCO/IBAD/Inconel coated conductor with end-to-end critical current of 96 A at 75 K Los Alamos Materials Science and Technology STC: Superconductivity Technology Center

Field Dependence of Critical Current Density

Bending 75 K

The Jc reduction above  1.5  m appears related to an increase in surface roughness with YBCO thickness... Superconductivity Technology Center 0.39  m1.5  m3.0  m J c = 2.3 MA/cm 2 calc. I c = 90 A/cm J c = 1.5 MA/cm 2 calc. I c = 225 A/cm J c = 0.6 MA/cm 2 calc. I c = 180 A/cm

Ion milling shows that a multilayer structure allows I c to continue to increase at thickness levels above 1.5  m Superconductivity Technology Center 75 K -- Bridge dimensions:  150  m x 5 mm Rate of increase: 60 A/cm-width for each additional micron of superconductor thickness

Y123-Sm123 Multilayers Enabled Thicker Films with Higher Critical Currents Superconductivity Technology Center Y- Sm-Y- Sm-Y multilayer YBCO thickness: ~1.1  m SBCO thickness: ~ 0.2  m Total thickness: 3.7  m J c : 1.1 MA/cm2 (75 K) Calculated I c : 405 A/cm-width For comparison, J c of a 3.7  m YBCO single-layer: 0.4 MA/cm 2 Silver contact YBCO Sm 1 Ba 2 Cu 3 O 7-  CeO 2 IBAD YSZ Inconel Bridge dimensions: ~ 200  m x 5 mm

Modified superconductor processes push the I c well beyond the 200 A/cm-width “barrier” to over 500 A/cm Superconductivity Technology Center Substrate: Inconel 625 with IBAD YSZ 75 K -- bridges  200  m x 5 mm

IBAD MgO template forms at ~ 10 nm thickness - approximately 100 times thinner/faster than for IBAD YSZ Los Alamos Superconductivity Technology Center 0.1 µm Thickness (nm)  (deg.) IBAD texture evolution vs. thickness YBCO YSZ Epi MgO Si 3 N 4 Inconel 625 Y2O3Y2O3 IBAD MgO I c (75K) = 42 A