| Autor: |
Koichi Itoh, Tadashi Sugawara, Hiromi Sakurai, Akira Izuoka, Kazunobu Sato, Takeji Takui, Masahiro Nisheawa, Daisuke Shiomi |
| Rok vydání: |
1996 |
| Předmět: |
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| Zdroj: |
ResearcherID |
| ISSN: |
1058-725X |
| DOI: |
10.1080/10587259608033686 |
| Popis: |
Spin state energies were calculated for a linear chain composed of a doublet radical and a biradical with a triplet ground state by numerical diagonalization of finite-size Heisenberg spin Hamiltonian. When all the intermolecular antiferromagnetic interactions couple the S=1/2 sites uniformly, a ferrimagnetic-like ground state appears. This finding is consistent with the simple picture of antiparallel alignment of different S's. On the other hand, quasidegenerate low-lying excited states appear as the spatial symmetry of intermolecular antiferromagnetic interactions is lowered. The quasi-degeneracy breaks the stability of the ferrimagnetic-like ground state. This result gives a qualitative explanation of the susceptibility and the spin-spin relaxation time measured for a nitronylnitroxide-based molecular crystal composed of an S=1/2 and S=1 molecules. The instability of the ferrimagnetic-like ground state is inherent in multi-centered antiferromagnetic interactions between the open-shell organic ... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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