Magnetic Properties in the Normal State of LuNi2B2C Observed by 61Ni and 11B NMR

Kenji Ikushima; Hiroshi Yasuoka; Akira Ohno; Hidenori Takagi; R. J. Cava; J. J. Krajewski; W. F. Peck

doi:10.1143/JPSJ.66.1130

Magnetic Properties in the Normal State of LuNi₂B₂C Observed by ⁶¹Ni and ¹¹B NMR

Kenji Ikushima, Hiroshi Yasuoka, Akira Ohno, Hidenori Takagi, R. J. Cava, J. J. Krajewski, W. F. Peck

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The ⁶¹Ni spin-lattice relaxation rate, ⁶¹T^-1₁, and the Knight shift of a 91% ⁶¹Ni enriched sample of LuNi₂B₂C have been measured in the normal state. It was found that ⁶¹(T₁T)^-1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be ⁶¹A = -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 ⁶¹Ni 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, χ(q), at finite wave vectors.

Original language	English (US)
Pages (from-to)	1130-1137
Number of pages	8
Journal	Journal of the Physical Society of Japan
Volume	66
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.66.1130
State	Published - Apr 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Keywords

Generalized susceptibility
Knight shift
Korringa relation
LuNiBC
NMR
Nuclear spin-lattice relaxation rate

Access to Document

10.1143/JPSJ.66.1130

Cite this

@article{8c079f72a53c4a47b71b301b6c965f7b,

title = "Magnetic Properties in the Normal State of LuNi2B2C Observed by 61Ni and 11B NMR",

abstract = "The 61Ni spin-lattice relaxation rate, 61T-11, and the Knight shift of a 91\% 61Ni enriched sample of LuNi2B2C have been measured in the normal state. It was found that 61(T1T)-1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be 61A = -16 kOe/μB, 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 (D2d) symmetry at the 61Ni 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, χ(q), at finite wave vectors.",

keywords = "Generalized susceptibility, Knight shift, Korringa relation, LuNiBC, NMR, Nuclear spin-lattice relaxation rate",

author = "Kenji Ikushima and Hiroshi Yasuoka and Akira Ohno and Hidenori Takagi and Cava, \{R. J.\} and Krajewski, \{J. J.\} and Peck, \{W. F.\}",

year = "1997",

month = apr,

doi = "10.1143/JPSJ.66.1130",

language = "English (US)",

volume = "66",

pages = "1130--1137",

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TY - JOUR

T1 - Magnetic Properties in the Normal State of LuNi2B2C Observed by 61Ni and 11B NMR

AU - Ikushima, Kenji

AU - Yasuoka, Hiroshi

AU - Ohno, Akira

AU - Takagi, Hidenori

AU - Cava, R. J.

AU - Krajewski, J. J.

AU - Peck, W. F.

PY - 1997/4

Y1 - 1997/4

N2 - The 61Ni spin-lattice relaxation rate, 61T-11, and the Knight shift of a 91% 61Ni enriched sample of LuNi2B2C have been measured in the normal state. It was found that 61(T1T)-1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be 61A = -16 kOe/μB, 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 (D2d) symmetry at the 61Ni 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, χ(q), at finite wave vectors.

AB - The 61Ni spin-lattice relaxation rate, 61T-11, and the Knight shift of a 91% 61Ni enriched sample of LuNi2B2C have been measured in the normal state. It was found that 61(T1T)-1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be 61A = -16 kOe/μB, 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 (D2d) symmetry at the 61Ni 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, χ(q), at finite wave vectors.

KW - Generalized susceptibility

KW - Knight shift

KW - Korringa relation

KW - LuNiBC

KW - NMR

KW - Nuclear spin-lattice relaxation rate

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