The Relevance of Non-axiality and Low-lying Excited States for Slow Magnetic Relaxation in Pentagonal-bipyramidal Erbium(III) Complexes Probed by High-frequency EPR
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| author | Arneth, J. Spillecke, L. Koo, C. Bazhenova, T. A. Yagubskii, E. B. Klingeler, R. |
| author_facet | Arneth, J. Spillecke, L. Koo, C. Bazhenova, T. A. Yagubskii, E. B. Klingeler, R. |
| contents | High-frequency/high-field electron paramagnetic resonance studies on a series of seven-coordinate pentagonal-bipyramidal (PBP) erbium(III) complexes Er(DAPMBH/H$_2$DAPS)X (H$_2$DAPMBH = 2,6-diacetylpyridine bis-4-methoxy benzoylhydrazone, H$_4$DAPS = 2,6-diacetylpyridine bis-(salicylhydrazone)) demonstrate the effects of different apical ligands (X = (H$_2$O)Cl (1), (CH$_3$OH)N$_3$ (2), Cl$_2$ (3)) on the local magnetic anisotropy of the central Er(III) ions. In particular, we report direct experimental determination of the effective $g$-values and zero field splittings of the energetically low-lying Kramers doublets. Our quantitative determination of the magnetic anisotropy highlights the relevance of an axial $g$-tensor for SMM behaviour and suggests that fast magnetic relaxation is mainly driven by a thermally assisted quantum tunnelling process via low-lying excited states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_21170 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Relevance of Non-axiality and Low-lying Excited States for Slow Magnetic Relaxation in Pentagonal-bipyramidal Erbium(III) Complexes Probed by High-frequency EPR Arneth, J. Spillecke, L. Koo, C. Bazhenova, T. A. Yagubskii, E. B. Klingeler, R. Strongly Correlated Electrons High-frequency/high-field electron paramagnetic resonance studies on a series of seven-coordinate pentagonal-bipyramidal (PBP) erbium(III) complexes Er(DAPMBH/H$_2$DAPS)X (H$_2$DAPMBH = 2,6-diacetylpyridine bis-4-methoxy benzoylhydrazone, H$_4$DAPS = 2,6-diacetylpyridine bis-(salicylhydrazone)) demonstrate the effects of different apical ligands (X = (H$_2$O)Cl (1), (CH$_3$OH)N$_3$ (2), Cl$_2$ (3)) on the local magnetic anisotropy of the central Er(III) ions. In particular, we report direct experimental determination of the effective $g$-values and zero field splittings of the energetically low-lying Kramers doublets. Our quantitative determination of the magnetic anisotropy highlights the relevance of an axial $g$-tensor for SMM behaviour and suggests that fast magnetic relaxation is mainly driven by a thermally assisted quantum tunnelling process via low-lying excited states. |
| title | The Relevance of Non-axiality and Low-lying Excited States for Slow Magnetic Relaxation in Pentagonal-bipyramidal Erbium(III) Complexes Probed by High-frequency EPR |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.21170 |