Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Bio- and Molecular Magnetism

MA 20.13: Vortrag

Dienstag, 21. März 2017, 12:45–13:00, HSZ 301

Polarized inelastic neutron scattering study of a single-molecule magnet Mn₅ — •Krunoslav Prsa¹, Hui-Lien Tsai², Hannu Mutka³, Pascale Deen⁴, and Oliver Waldmann¹ — ¹Physikalisches Institut Universität Freiburg, Germany — ²Department of Chemistry, National Cheng Kung University, Tainan, Taiwan — ³Institut Laue Langevin, 6 Rue Jules Horowitz, B.P. 156, 38042 Grenoble, Cedex 9, France — ⁴European Spallation Source, Tunavagen 24, 223 63 Lund, Sweden

The polarized inelastic neutron scattering technique extends the usual non-polarized variety by being able to discern between the vibrational and magnetic signals. We show results of inelastic neutron scattering study on a coventional 3d-element single-molecule magnet Mn₅ [1]. The non-polarized data taken at the IN5 spectrometer reveal five peaks with additional broader features in the spectrum: I at 0.38 meV, II at 0.55 meV, III at 1.9 meV and IV at 3.8 meV and V at 7.7 meV. Based on the temperature dependence, the peak I is clearly a cold magnetic peak, while for the other peaks the assignment was less obvious. A subsequent polarized experiment at the D7 spectrometer directly proved the magnetic origin of the peak III. In addition, the polarization analysis of the elastic channel enabled extraction of the pure nuclear scattering that confirmed the persistence of the crystal structure upon cooldown. Together with the published thermodynamical data [1], these results have allowed us to determine the parameters of the microscopic Hamiltonian of the system.

[1] C-I. Yang et. al., JACS 456-457 (129), 2007.