Relieving frustration: The case of antiferromagnetic Mn3molecular triangles
| Autor: | Changhyun Koo, Stephen Hill, Eun Sang Choi, Junjie Liu, Patrick L. Feng, Asma Amjad, E. del Barco, David N. Hendrickson |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Condensed matter physics media_common.quotation_subject Frustration Zero field splitting Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetization Magnetic anisotropy law Excited state Antiferromagnetism Electron paramagnetic resonance Ground state media_common |
| Zdroj: | Physical Review B. 84 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | Recently, various triangular [Mn${}^{\mathrm{III}}$]${}_{3}$ molecules have been extensively studied due to the fact that one can modulate the magnitude and the sign of the inter-ion exchange, thereby giving rise to very simple clusters that constitute some of the cleanest and best examples of so-called single-molecule magnets. However, magnetic and electron paramagnetic resonance (EPR) characterizations of low-spin antiferromagnetic [Mn${}^{\mathrm{III}}$]${}_{3}$ complexes have been problematic due to the significant spin frustration that exists for this topology. We show that this frustration is relieved in the highly distorted [NEt${}_{4}$]${}_{3}$Mn${}_{3}$Zn${}_{2}$(salox)${}_{3}$O(N${}_{3}$)${}_{8}$]\ifmmode\cdot\else\textperiodcentered\fi{}MeOH molecule: Susceptibility data suggest a well isolated S = 2 ground state; EPR spectroscopy and high-field torquemetry support this conclusion and further indicate the presence of a very significant zero-field-splitting (zfs) separating the lowest-lying ${m}_{S}$ = \ifmmode\pm\else\textpm\fi{}2 states from the excited levels within the same S = 2 multiplet. Remarkably, this zfs is sufficient to give rise to magnetic bistability, as evidenced through the observation of low-temperature magnetization hysteresis. |
| Databáze: | OpenAIRE |
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