Magnetic Properties in the Normal State of LuNi2B2C Observed by61Ni and11B NMR

Autor:	W. F. Peck, Hidenori Takagi, J. J. Krajewski, Akira Ohno, Hiroshi Yasuoka, Robert J. Cava, Kenji Ikushima
Rok vydání:	1997
Předmět:	Free electron model Physics Tetragonal crystal system Tight binding Condensed matter physics Spin–lattice relaxation General Physics and Astronomy Condensed Matter::Strongly Correlated Electrons Knight shift Electronic band structure Magnetic susceptibility Order of magnitude
Zdroj:	Journal of the Physical Society of Japan. 66:1130-1137
ISSN:	1347-4073 0031-9015
Popis:	The 61 Ni spin-lattice relaxation rate, 6l Ti 1 -1 , and the Knight shift of a 91% 61 Ni enriched sample of LuNi 2 B 2 C have been measured in the normal state. It was found that 61 (T 1 T) -1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be 61 A = -16 kOe/μ B , which is an order of magnitude smaller than that due to the 3d-core-polarization mechanism. When the orbital term of the relaxation rate is given by the formula calculated for the tetragonal (D 2d ) symmetry at the 61 Ni sites, much larger d-spin term than that expected from the Knight shift is obtained. The Korringa relation is also discussed on the assumption that the hyperfine coupling constant is reduced by a strong s-d admixture, and then the deviation from the Korringa relation for free electrons, K(α), is more than one. This result suggests the significance of the generalized susceptibility, X(q), at finite wave vectors.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dcbc3866c65c789c7872da12cebe25b2 https://doi.org/10.1143/jpsj.66.1130 Zobrazit plný text záznamu