DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.57: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Josephson-like spin current in junctions composed of antiferromagnets and ferromagnets — •Andreas Moor, Anatoly Volkov, and Konstantin Efetov — Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany

We study Josephson-like junctions formed by materials with antiferromagnetic (AF) order parameters. As an antiferromagnet, we consider a two-band material in which a spin density wave (SDW) arises, e.g., the Fe-based pnictides in the temperature interval TcTTN, where Tc and TN are the critical temperatures for the superconducting (S) and antiferromagnetic transitions, respectively. We have generalized the theory of quasiclassical Green’s functions to two-band superconductors, in which superconducting and antiferromagnetic ordering may coexist, and derived the equations for the quasiclassical Green’s functions. Especially, we are interested in the Josephson-like spin current in the AF/F/AF (F means a ferromagnet) structures, where the short- and long-range components can be identified. This is an analogy with the case of the Josephson current in an S/F/S junction with a nonhomogeneous magnetization where short- and long-range condensate components are induced in the F-layer. However, the analogy is not complete due to the fact that the spin current in AF/F/AF junctions is not constant in space, but oscillates in the ballistic F-layer.
 A. Moor, A. F. Volkov, and K. B. Efetov, Phys. Rev. B 83, 134524 (2011);
 A. M., A. F. V., and K. B. E., arXiv:1111.5582;
 F. S. Bergeret, A. F. Volkov, K. B. Efetov, Rev. Mod. Phys. 77, 1321 (2005);
 M. Eschrig, Physics Today, 64, 43 (2011).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin