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27Al NMR Study in UNiAl

✍ Scribed by Bogdan Nowak; Robert Troć

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
121 KB
Volume
18
Category
Article
ISSN
0926-2040

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✦ Synopsis

The ternary compound UNiAl exhibiting an antiferromagnetic order below T N = 19 3 K has been studied in the paramagnetic state using the 27 Al NMR technique and different magnetically oriented samples. The quadrupole coupling constant e 2 qQ/h = 1 56 MHz is temperature independent. The dominant, longitudinal component of the Knight shift with respect to the hexagonal c axis, K , is positive and increases upon lowering the temperature down to 50 K. Much smaller in magnitude, the transverse component, K ⊥ , is also positive and only slightly temperature dependent. The plots of the Knight shift vs magnetic susceptibility K (χ ) and K ⊥ (χ ⊥ ) form the same line, which implies that the transferred hyperfine field of 9.2 kOe/µB for 27 Al nuclei should be considered isotropic.

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