ESR line shift in NiSnCl6·6H2O at very low temperatures |
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| Authors: | M Shimizu Y Ajiro K Koga H Abe |
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| Institution: | Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan;The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minatoku, Tokyo 106, Japan |
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| Abstract: | Electron spin resonance in a single-ground-state magnet, NiSnCl6·6H2O, has been studied at temperatures between 83 mK and 4.2 K. Below 1 K, the resonance lines show marked shifts, which can be described quantitatively in terms of exchange shift due to polarization effects treated by McMillan and Opechowski. The shifts give 2J = ?(0.55 ± 0.15) × 10?2 cm?1 for the antiferromagnetic exchange interaction among the Ni2+ ions in this crystal. The value of 2J is sub-critical in the sense that no spontaneous long-range order can be expected in this singlet-ground-state magnet. |
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