TERAHERTZ RESPONSE FOR BICRYSTAL YBCO JOSEPHSON-JUNCTIONS

Authors
NAKAJIMA K CHEN J MYOREN H YAMASHITA T WU PH
Citation
K. Nakajima et al., TERAHERTZ RESPONSE FOR BICRYSTAL YBCO JOSEPHSON-JUNCTIONS, IEEE transactions on applied superconductivity, 7(2), 1997, pp. 2607-2610
Citations number
8
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Applied
Journal title
IEEE transactions on applied superconductivity → ACNP
ISSN journal
10518223
Volume
7
Issue
2
Year of publication
1997
Part
3
Pages
2607 - 2610
Database
ISI
SICI code
1051-8223(1997)7:2<2607:TRFBYJ>2.0.ZU;2-Y
Abstract
High-frequency response of bicrystal YBa2Cu3O7-delta Josephson junctio ns for far infrared laser irradiation is presented. The junctions on s ilicon and MgO substrates exhibit the remarkable first order Shapiro s tep for the methanol line at 1.76 THz. dV/dI measurements reveal sever al steps corresponding to the methanol lines at 1.48, 1.76 and 2.53 TH z. The line width of Josephson oscillation at these frequencies is est imated from the width of the Shapiro steps. It is suggested that the e xcess shot noise broaden the line width.