Abstract
We have measured angular-dependent fluorescence-yield x-ray magnetic circular dichroism spectra on single crystals of the heterometallic 3d-4f 12-metallacrown-4 TbMn4 and DyMn4 complexes. Simulated spectra using crystal-field multiplet calculations reproduce the experimentally observed spectra. The orientation of the molecules causes linear dichroism spectra of the 4f absorption spectra. This natural linear dichroism shows the anisotropic charge distribution of the rare-earth 4f state in the tetragonal crystal field despite the small 4f crystal-field splitting. The magnetic moment of the molecule is dominated by the rare-earth moment revealing a considerably large contribution of orbital moment. From a sum-rule analysis of experimental and simulated x-ray magnetic circular dichroism, we determined corrected spin and orbital Dy moments at low temperature (14 K) within a magnetic field of 7 T. We find a significant angular dependence of the Dy magnetic moments, indicating the presence of fourth-order magnetic anisotropy.
| Original language | English |
|---|---|
| Article number | 134415 |
| Pages (from-to) | 1-10 |
| Journal | Physical Review B |
| Volume | 105 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 1 Apr 2022 |
Bibliographical note
Funding Information:Funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–TRR 173–268565370 (Project No. A09) is gratefully acknowledged. The authors acknowledge financial support for the VEKMAG project and for the PM2-VEKMAG beamline by the German Federal Ministry for Education and Research (BMBF 05K10PC2, 05K10WR1, 05K10KE1) and by HZB. Steffen Rudorff is acknowledged for technical support.
Publisher Copyright:
© 2022 American Physical Society.
Funding
Funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–TRR 173–268565370 (Project No. A09) is gratefully acknowledged. The authors acknowledge financial support for the VEKMAG project and for the PM2-VEKMAG beamline by the German Federal Ministry for Education and Research (BMBF 05K10PC2, 05K10WR1, 05K10KE1) and by HZB. Steffen Rudorff is acknowledged for technical support.