Till sidans topp

Sidansvarig: Webbredaktion

Giant oscillations of the… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

# Giant oscillations of the density of states and the conductance in a ferromagnetic conductor coupled to two superconductors

Kapitel i bok
Författare Anatoli M. Kadigrobov Robert I. Shekhter Mats Jonson Progress in Ferromagnetism Research 147-169 1-59454-335-6 2005 Institutionen för fysik (GU) 147-169 en Den kondenserade materiens fysik

## Sammanfattning

Giant oscillations of the density of electronic states and the differential conductance of a superconductor-ferromagnet-superconductor structure are predicted for the case when the exchange energy, $I_0$, due to the interaction between the electron spin and the spontaneous moment of the ferromagnet is smaller than the superconductor energy gap, $\Delta$. The effect is due to the extremely large degeneration of the energy level $\epsilon = I_0$ when the superconductor phase difference $\phi$ is close to odd multiple of $\pi$ ($\epsilon$ is the electron energy measured from the Fermi-energy). This quantum interference effect persists even in long ferromagnetic bridges whose length much exceeds the ''magnetic length'' ($\hbar v_{F}/I_{0}$ in the ballistic regime and $\sqrt{\hbar D/I_0}$ in the diffusive regime; $D$ is the electron diffusion constant). The predicted effect allows a direct spectroscopy of Andreev levels in the ferromagnet as well as a direct measurement of the exchange energy,$I_0$