pi-0 transition in superconductor-ferromagnet-superconductor junctions

Citation
Nm. Chtchelkatchev et al., pi-0 transition in superconductor-ferromagnet-superconductor junctions, JETP LETTER, 74(6), 2001, pp. 323-327
Citations number
17
Categorie Soggetti
Physics
Journal title
JETP LETTERS
ISSN journal
00213640 → ACNP
Volume
74
Issue
6
Year of publication
2001
Pages
323 - 327
Database
ISI
SICI code
0021-3640(2001)74:6<323:PTISJ>2.0.ZU;2-I
Abstract
Superconductor-ferromagnet-superconductor (SFS) Josephson junctions are kno wn to exhibit a transition between pi and 0 states. In this letter, we find the pi -0 phase diagram of an SFS junction depending on the transparency o f an intermediate insulating layer (I). We show that, in general, the Josep hson critical current is nonzero at the pi -0 transition temperature. Contr ibutions to the current from the two spin channels nearly compensate each o ther, and the first harmonic of the Josephson current as a function of phas e difference is suppressed. However, higher harmonics give a nonzero contri bution to the supercurrent. (C) 2001 MAIK "Nauka / Interperiodica".