Fig. 4: Crystal field sublevels and magnetic axis for the [Na8Y4ErF24]− theoretical model. | Nature Communications

Fig. 4: Crystal field sublevels and magnetic axis for the [Na8Y4ErF24]− theoretical model.

From: Confining single Er3+ ions in sub-3 nm NaYF4 nanoparticles to induce slow relaxation of the magnetisation

Fig. 4

a Energy spectra and qualitative magnetization blocking barriers for [Na8Y4ErF24]−. Black lines represent the calculated Kramers doublets, and they are placed in the spectrum according to their magnetic moment. The numbers show the transition probabilities (in μB) between the calculated Kramers doublets for the two lowest-lying spin-orbit states. Red, blue and purple lines correspond to direct, Orbach, and QTM processes, respectively. b Orientation of the main magnetic axes—Xm (green), Ym, (yellow) and Zm (red)—of the ground Kramers doublet of Er3+ ion in [Na8Y4ErF24]− fragment. See Fig. S9 for additional information and a comparison with other fragments.

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