Figure 2: Kondo effect for different molecular thicknesses of CuPc.
From: Spin doping using transition metal phthalocyanine molecules
(a) Normalized resistivity versus temperature in log-2 scale. Open symbols correspond to CuPc nominal thicknesses of 10, 20, 30, 40 and 50 Å. Black solid line corresponds to the 99.99% pure 200 Å thick gold reference film. (b) Universal Kondo plot of the normalized resistivity divided by respective residual resistivity, 
, against temperature normalized to the Kondo temperature, 
, for all thicknesses. Solid line represents the exact numerical renormalization group (NRG) solution predicted for a S=1/2 system of noninteracting diluted magnetic impurities. TK was determined to be 3.4±0.2 K. (c) ρ0 as a function of Tmin for the different CuPc thicknesses. Error bars were determined from the s.d. of the fittings.
