Composition-dependent antiferromagnetism in low-dimensional hybrid organic cobalt-halide semiconductors
Low-dimensional - magnets exhibit complex magnetic phases for studying - fundamental spin ordering phenomena, while semiconducting variants of these materials are explored for all-optical control and readout of magnetic states. Thus, the discovery of systems with compositional tuning of optical and...
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
May 26, 2026
|
| In: |
Chemistry of materials
Year: 2026, Volume: 38, Issue: 10, Pages: 5267-5275 |
| ISSN: | 1520-5002 |
| DOI: | 10.1021/acs.chemmater.6c00755 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1021/acs.chemmater.6c00755
|
| Author Notes: | Shangpu Liu, Jonathan Zerhoch, Stanislav Bodnar, Julia A. Gessner, Luca Bischof, Jan Arneth, Franz Bodenmüller, Joachim Ballmann, Frank Rominger, Rüdiger Klingeler, and Felix Deschler |
| Summary: | Low-dimensional - magnets exhibit complex magnetic phases for studying - fundamental spin ordering phenomena, while semiconducting variants of these materials are explored for all-optical control and readout of magnetic states. Thus, the discovery of systems with compositional tuning of optical and magnetic properties unlocks emerging functionalities and fundamental investigations. Here, we report the synthesis of low-dimensional (canted-)antiferromagnets (R)-3YMBA2CoX4 (Y, - X = halide; MBA = methylbenzylamine) and study their magnetic and optical properties. Structural characterization confirms distorted Co-halide tetrahedra separated by organic groups, forming chiral crystal structures. Magnetic measurements reveal composition-dependent (canted) - antiferromagnetism at high cryogenic temperatures. While (R)-3ClMBA2CoBr4 was identified as an easy-plane-type antiferromagnet, - (R)-3BrMBA2CoI4 was found to exhibit canted - antiferromagnetism showing a 50 times higher spontaneous magnetic - moment than that of reported hybrid metal halides. Using optical measurements, - we find an optically active metal-ligand charge-transfer state - involving cobalt atoms that participate in the magnetic ordering. - Using photoexcitation of the metal-ligand transfer state for - optical spin-alignment in ultrafast magneto-optical measurements, - we find a spin dephasing time of 60 ps in our hybrid cobalt compounds, - exceeding spin lifetimes of related low-dimensional hybrid metal halides. - Our report introduces a promising material platform for symmetry-mediated - spin control, paving the way for hybrid quantum materials with optical - spin manipulation capabilities. |
|---|---|
| Item Description: | Online veröffentlicht: 06. Mai 2026 Gesehen am 31.07.2026 |
| Physical Description: | Online Resource |
| ISSN: | 1520-5002 |
| DOI: | 10.1021/acs.chemmater.6c00755 |