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Far Infrared Resonance Transition Study of the Chain-End S = 1/2 Modes in an S = 1 Antiferromagnetic Chain |
| LU Wei1,2;SHEN Xuechu1;LIU Pulin1;M. von Ortenberg3;J . Tuchendler4;J . P. Renard5;ZHENG Fen6 |
| 1National Laboratory for Infrared Physics, Academia Sinica, Shanghai Institute of Technical Physics, Academia Sinica, Shanghai 200083
2Fudan-T. D. Lee Physics Laboratory, Department of Physics, Fudan University, Shanghai 200433
3Humboldt University of Berlin, Invalidenstraβe 110, 0-1040 Berlin, F. R. Germany
4Lahoratoire de Dispositiofs Infrarouge et Micro-Ondes, Université Paris VI, F-75252 Paris, France
5Institut d’Electronique Fondamentale, Université Paris-Sud, F-91405 Orsay, France
6Department of Biology, Shanghai Normal University, Shanghai 200234
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| Cite this article: |
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LU Wei, SHEN Xuechu, LIU Pulin et al 1995 Chin. Phys. Lett. 12 313-316 |
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Abstract The unpaired spin S = 1/2 states which occur at the ends of an S = 1 Heisenberg-like antiferromagnetic chain, have been observed recently in low-temperature electron spin-resonance measurements of Ni(C2H8N2)2 NO2 ClO4containing selected impurities. We present here a further study on this topic by far infrared transmission spectra under the magnetic field. The splitting of S = 1/2 modes was clearly observed and explained by the interaction of S = 1/2 modes at two nearby chains, which can be separated by vacancy-like defect.
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| Keywords:
75.10.Jm
75. 30. Hx
76.30.Fc
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Published: 01 May 1995
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75. 30. Hx
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76.30.Fc
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(Iron group (3d) ions and impurities (Ti-Cu))
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