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
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
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.
LU Wei;SHEN Xuechu;LIU Pulin;M. von Ortenberg;J . Tuchendler;J . P. Renard;ZHENG Fen. Far Infrared Resonance Transition Study of the Chain-End S = 1/2 Modes in an S = 1 Antiferromagnetic Chain[J]. 中国物理快报, 1995, 12(5): 313-316.
LU Wei, SHEN Xuechu, LIU Pulin, M. von Ortenberg, J . Tuchendler, J . P. Renard, ZHENG Fen. Far Infrared Resonance Transition Study of the Chain-End S = 1/2 Modes in an S = 1 Antiferromagnetic Chain. Chin. Phys. Lett., 1995, 12(5): 313-316.
1995, Vol. 12 
