Proton spin‐lattice relaxation in low‐dimensional ferromagnetic copper halides (abstract)
| Autor: | R. F. Marzke, D. P. Raffaelle, B. L. Ramakrishna, D. N. Haines, Ralph V. Chamberlin |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 69:5966-5966 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.347832 |
| Popis: | 1H spin‐lattice relaxation times have been measured as functions of temperature and frequency in powder samples of the two‐dimensional ferromagnetic compound (CH3NH3)2CuCl4 and in single crystals of the one‐dimensional ferromagnets (C6H11NH3)CuB3 (CHAB), (C6H11NH3)CuCl3 (CHAC), and (C4H12N)CuCl3 (TMCuC). Sample temperatures were varied between 4.2 and 298 K, and NMR frequencies ranging from 12.6 to 54.0 MHz were used. Widths and shapes of the lines, typically several hundred Gauss broad at low temperatures, were recorded. The dependence of T1 upon magnetic field orientation was measured for the one‐dimensional (1D) single crystal samples. Each compound showed basically two temperature regimes of different spin‐lattice relaxation behavior, separated by a narrow transition temperature region. From 4.2 K, T1 in the compounds decreased strongly as the temperature was raised, a behavior expected for second‐order Raman processes [K. M. Kopinga, A. M. C. Tinus, W. J. M. de Jonge, and G. C. de Vries, Phys. Rev. B... |
| Databáze: | OpenAIRE |
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