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Relieving frustration: The case of antiferromagnetic Mn3molecular triangles
- Source :
- Physical Review B. 84
- Publication Year :
- 2011
- Publisher :
- American Physical Society (APS), 2011.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 84
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........c3746cdfed0d89543d54be1976a69c98