Digitale Medien
Springer
Hyperfine interactions
54 (1990), S. 689-694
ISSN:
1572-9540
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract We have studied the magnetic hyperfine interactions in GdAl3 using155Gd Mössbauer spectroscopy between the temperatures of 4K and 90K. Previous studies on GdAl3 have shown that antiferromagnetic ordering occurs at 18K, and that a fit of the susceptibility to 1/(T-θp) yields a θp value of −89K. The large ratio of θp to TN is indicative of magnetic frustration between competing ferro-and antiferromagnetic interactions, which may be due to a combination of the oscillatory nature of the RKKY interaction and the geometry of the hexagonal lattice. Our studies show that the saturation magnetic hyperfine field at the Gd site is −24.0 T, with the moments lying in the basal plane. The efg at the gadolinium site is 2.55(1)×1017V cm−2 which is considerably larger than the value predicted by a point charge calculation. This difference may indicate that there is a conduction electron contribution. A helical magnetic structure has been calculated from RKKY theory.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02396113
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