Physics – Condensed Matter – Superconductivity
Scientific paper
2007-08-20
Phys. Rev. B 76, 224523 (2007)
Physics
Condensed Matter
Superconductivity
submitted to PRB
Scientific paper
10.1103/PhysRevB.76.224523
Several recent experiments revealed a change of the sign of the first harmonic in the current-phase relation of Josephson junctions (JJ) based on novel superconductors, e.g., d-wave based or JJ with ferromagnetic barrier. In this situation the role of the second harmonic becomes dominant and it determines the scenario of a 0-pi transition. We discuss different mechanisms of the second harmonic generation and its sign. If the second harmonic is negative the 0-pi transition becomes continuous and the realization of the so-called varphi junction is possible. We study the unusual properties of such a novel JJ and analyze the possible experimental techniques for their observation.
Buzdin Alexandre
Goldobin Edward
Kleiner Reinhold
Koelle Dieter
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