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A Mechanism for Photoinduced Effects In Tetracyanoethylene-Based Organic Magnets | | Serkan Erdin
; Michel van Veenendaal
; | | Date: |
13 Jun 2006 | | Subject: | Materials Science; Strongly Correlated Electrons | | Abstract: | The photoinduced magnetism in manganese-tetracyanoethylene (Mn-TCNE) molecule-based magnets is ascribed to charge-transfer excitations from manganese to TCNE. Charge-transfer energies are calculated using Density Functional Theory; photoinduced magnetization is described using a model Hamiltonian based on a double-exchange mechanism. Photoexciting electrons from the manganese core spin into the lowest unoccupied orbital of TCNE with photon energies around 3 eV increases the magnetization through a reduction of the canting angle of the manganese core spins for an average electron density on TCNE less than one. When photoexciting with a smaller energy, divalent TCNE molecules are formed. The delocalization of the excited electron causes a local spin flip of a manganese core spin. | | Source: | arXiv, cond-mat/0606343 | | Services: | Forum | Review | PDF | Favorites | |
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