Figure 4
From: Evidence of Magnetic Inversion in Single Ni Nanoparticles
Current-Voltage measurements, discrete levels at T = 30 mK, and zero-field splitting: (a) Sample 1. Steps K1−4 indicate discrete levels. Upper graph in the inset displays differential conductance versus bias voltage in the vicinity of levels K1 and K2, at three magnetic fields. The traces are offset by 1nS for clarity. Lower image in the inset is the conductance map with voltage and magnetic field, showing that K1 and K2 resolve into Zeeman splitting between 
and 
in the strong magnetic field. (b) Sample 2. Peaks L1−7 indicate discrete levels followed by regions of negative differential conductance. The inset displays differential conductance traces in the vicinity of levels L1 − L4, at three magnetic fields. The traces are offset by 6nS for clarity. Zero field splitting between levels L3 and L4 resolves into nonlinear Zeeman splitting between levels 
and 
. In both (a,b), the splitting is significantly reduced and cannot be resolved in nonzero magnetic field, indicating near degeneracy, as shown by the red lines in the insets.
