Dresden 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.26: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Spin and Charge Josephson effects between non-uniform superconductors with coexisting helimagnetic order — •Ilya Eremin^1,2, Flavio S. Nogueira³, and Rene-Jean Tarento⁴ — ¹Max-Planck Institut für Physik komplexer Systeme, Nöthnitzerstr 38, D-01187 Dresden, Germany — ²Institut für Mathematische/Theoretische Physik, Technische Universität Carolo-Wilhelmina zu Braunschweig, D-38106 Braunschweig, Germany — ³Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — ⁴Laboratoire de Physique des Solides, UMR 8502 - Université Paris-Sud, Bât. 510, F-91405 Orsay Cedex, France

We consider the spin and charge Josephson current between two non-uniform superconductors with helimagnetic order. We demonstrate that the presence of the helimagnetic phase generates a spin Josephson effect and leads to additional contributions to both single-particle and Josephson charge current. It is shown that for such systems the AC effect differs more radically from the DC effect than in the case of a BCS superconductor. The most interesting effect occurs in the presence of an external magnetic field and in absence of voltage, where we show that the charge Josephson current can be tuned to zero while the spin Josephson current is non-vanishing. This provides a well controlled mechanism to generate a spin supercurrent in absence of charge currents.