The NQR observation of spin-Peierls transition in an antiferromagnetic MX-chain complex [NiBr(chxn)2]Br2 |
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Authors: | Takaishi Shinya Tobu Yasuhiro Kitagawa Hiroshi Goto Atsushi Shimizu Tadashi Okubo Takashi Mitani Tadaoki Ikeda Ryuichi |
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Institution: | Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan. takaishi@comp.metro-u.ac.jp |
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Abstract: | 81Br Nuclear quadrupole resonance (NQR) measurement was performed in an S = 1/2 one-dimensional Heisenberg antiferromagnetic metal complex NiBr(chxn)2]Br2 (chxn: 1R,2R-diaminocyclohexane), having a halogen-bridged MX chain structure -Br-Ni3+-Br-Ni3+-Br-. Two 81Br NQR signals were observed below 40 K, while a single signal was observed above 130 K, showing the presence of two nonequivalent bridging Br sites below 40 K. This NQR result together with previously reported magnetic susceptibility and X-ray results indicate the occurrence of a transition into a spin-Peierls state between 40 and 130 K. This communication reports the first spin-Peierls transition in metal complexes in which pure d electrons contribute to the magnetism. In addition, we demonstrated a new experimental method for studying a spin-Peierls system. |
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