期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 320, 期 20, 页码 E575-E577出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2008.04.018
关键词
delafossite CuFeO2; Mossbauer spectroscopy
资金
- National Research Foundation of Korea [핵06A2805] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We have studied the magnetic spin structure of antiferromagnetic CuFeO2 by X-ray diffraction (XRD) and Mossbauer spectroscopy. Its crystal structure determined by XRD analysis was a rhombohedral structure ( space group R-3m) and lattice constants a(0) and c(0) were 3.0333 and 17.1595 angstrom, respectively. In spite of 4-Fe sublattices in a delafossite CuFeO2, its Mossbauer spectra were analyzed with 1-set (6-Lorentzian lines) below 10K due to the collinear-commensurate spin structure, but the spectra were fitted with 4-sextet above 10K due to the incommensurate spin structure. This phenomenon was attributed to the spin-lattice relaxation effect. Magnetic Neel temperature was also determined at 18 K, which corresponded to the high-spin Fe3+ valance state. On the other hand, CuFe0.98Al0.02O2 powder with a noncollinear spin structure was fitted with 4-sextet at 4.2 K. (c) 2008 Elsevier B.V. All rights reserved.
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