LOW-FREQUENCY (1 F) NOISE IN YBA2CU3O7-DELTA GRAIN-BOUNDARY JUNCTION DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES/

Authors
CHEN J OGAWA T NAKAMURA H MYOREN H NAKAJIMA K YAMASHITA T
Citation
J. Chen et al., LOW-FREQUENCY (1 F) NOISE IN YBA2CU3O7-DELTA GRAIN-BOUNDARY JUNCTION DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES/, Journal of applied physics, 76(3), 1994, pp. 1895-1898
Citations number
16
Categorie Soggetti
Physics, Applied
Journal title
Journal of applied physics → ACNP
ISSN journal
00218979
Volume
76
Issue
3
Year of publication
1994
Pages
1895 - 1898
Database
ISI
SICI code
0021-8979(1994)76:3<1895:L(FNIY>2.0.ZU;2-F
Abstract
We have studied low frequency (1/f) noise of YBa2Cu3O7-delta dc superc onducting quantum interference devices (SQUIDs) on SrTiO3 bicrystal su bstrates. 1/f flux noise, either measured at different temperatures fo r optimized bias current or measured at 77 K for different bias curren ts, is almost constant. These facts imply that 1/f noise mainly comes from fluctuations of the critical current of the Josephson junction th at form the SQUID. Also, we explain the critical current fluctuations in the junction by an equilibrium temperature fluctuation model.