Characterization of the S = 9 excited state in Fe8Br8 by Electron Paramagnetic Resonance

Details Characterization of the S = 9 excited state in Fe8Br8 by Electron Paramagnetic Resonance Characterization of the S = 9 excited state in Fe8Br8 by Electron Paramagnetic Resonance

2003-09-05

arxiv.org/abs/cond-mat/0309159v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, Figs included in text, submitted to PRB

Scientific paper

10.1103/PhysRevB.68.184408

High Frequency electron paramagnetic resonance has been used to observe the magnetic dipole, $\Delta$ M$_s$ = $\pm$ 1, transitions in the $S = 9$ excited state of the single molecule magnet Fe$_8$Br$_8$. A Boltzmann analysis of the measured intensities locates it at 24 $\pm$ 2 K above the $S = 10$ ground state, while the line positions yield its magnetic parameters D = -0.27 K, E = $\pm$0.05 K, and B$_4^0$ = -1.3$\times$ 10$^{-6}$ K. D is thus smaller by 8% and E larger by 7% than for $S = 10$. The anisotropy barrier for $S = 9$ is estimated as 22 K,which is 25% smaller than that for $S = 10$ (29 K). These data also help assign the spin exchange constants(J's) and thus provide a basis for improved electronic structure calculations of Fe$_8$Br$_8$.

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