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The anisotropy of the magnetic hyperfine interaction for 27Al nuclei in ferromagnetically ordered GdAl(2) is determined for T less than or equal to 0.7T(C) using NMR on a single crystalline sphere. The pseudodipolar contribution amounts to about 12 % of the dipolar contribution and depends linearly on the temperature-dependent magnetisation. The temperature dependence of the quadrupolar splitting for the 27Al a site and for magnetisation oriented along the (111) direction is measured from T = 4.2 K up to the paramagnetic range. It also varies linearly with the magnetisation. With the help of relativistic energy-band-structure calculations, the important role of the orbital polarisation of the conduction electrons in the ferromagnetically ordered state is examined for these phenomena. These numerical results also give an explanation of the anomalies reported earlier for the 27Al Knight shift and the 157Gd quadrupolar splitting in the ferromagnetic state of cubic Laves-phase structured GdAl(2).

Additional information

Authors: BAUER M, Universität Bayreuth, Physikalisches Institut (DE);BROOKS M S S, JRC Karlsruhe (DE);DORMANN E, Universität Karlsruhe, Physikalisches Institut (DE)
Bibliographic Reference: Article: Physical Review B, Vol. 48 (1993) No. 2, pp. 1014-1021
Record Number: 199311371 / Last updated on: 1994-11-28
Original language: en
Available languages: en