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NMR investigations on single crystals of : A Kondo insulator

✍ Scribed by A.K. Rajarajan; A. Rabis; M. Baenitz; A.A. Gippius; E.N. Morozova; J.A. Mydosh; F. Steglich

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
233 KB
Volume
359-361
Category
Article
ISSN
0921-4526

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✦ Synopsis

U 2 Ru 2 Sn is unique among all Kondo insulators because of its tetragonal structure and an energy gap of about 150 K being the smallest of all the uranium-based Kondo insulators. We report Knight shift KðTÞ and relaxation rate T À1 1 measurements from 119 SnðI ¼ 1 2 Þ-NMR for the first time in single crystals and oriented micro-crystallites. At low temperatures the anisotropy in KðTÞ increases (K k =K ? ð4:2 KÞ % 2), a trend observed also in wðTÞ and rðTÞ: KðH ? cÞ exhibits a smooth variation, whereas for KðH k cÞ a change of slope occurs at 150 K with a more rapid decrease below. The anisotropy is not as prominent in T À1

1 ðTÞ: The hyperfine coupling constant exhibits a cross-over behaviour from one linear regime of KðTÞ vs. wðTÞ to another around a characteristic temperature.

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