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Millimeter wave surface resistance of epitaxially grown YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ thin films

Journal Article · · Appl. Phys. Lett.; (United States)
DOI:https://doi.org/10.1063/1.101472· OSTI ID:6552555

We have measured the surface resistance of two c-axis oriented YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ thin-film samples in a copper host cavity at 86.7 GHz between 4.2 and 300 K. High quality films of 0.6 and 0.4 ..mu..m thickness have been grown epitaxially on SrTiO/sub 3/ by pulsed excimer laser ablation. Their millimeter wave absorption drops sharply at a transition temperature of 86 and 88 K to a corresponding surface resistance at 77 K of 18 m..cap omega.. and less than 8 m..cap omega.., respectively. These values exceed the best results on polycrystalline samples and come close to the expectation from classical superconductors. Therefore, applications of high T/sub c/ superconductors up to THz frequencies can be envisaged now.

Research Organization:
Fachbereich Physik, Bergische Universitaet, Gesamthochschule Wuppertal, D-5600 Wuppertal 1, West Germany
OSTI ID:
6552555
Journal Information:
Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:8; ISSN APPLA
Country of Publication:
United States
Language:
English