title: Universality of the Kondo effect in quantum dots with ferromagnetic leads.
abstract: We investigate quantum dots in clean single-wall carbon nanotubes with ferromagnetic PdNi-leads in the Kondo regime. Most of the Kondo resonances exhibit a splitting, which depends on the tunnel coupling to the leads and an external magnetic field B, but only weakly on the gate voltage. Using numerical renormalization group calculations, we demonstrate that all salient features of the data can be understood using a simple model for the magnetic properties of the leads. The magnetoconductance at zero bias and low temperature depends in a universal way on gμ(B)(B-B(c))/k(B)T(K), where T(K) is the Kondo temperature and B(c) the external field compensating the splitting.
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany. markus.gaass@physik.uni-regensburg.de
authors: M
authors: M
authors: Gaass
authors: A K
authors: AK
authors: Hüttel
authors: K
authors: K
authors: Kang
authors: I
authors: I
authors: Weymann
authors: J
authors: J
authors: von Delft
authors: Ch
authors: Ch
authors: Strunk