Temperature Dependence of the Magnetic Hyperfine Field at 140Ce on Gd Sites in GdAg Compound |
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Authors: | F H M Cavalcante A W Carbonari R N Saxena J Mestnik-Filho |
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Institution: | 1. Instituto de Pesquisas energéticas e Nucleares - IPEN-CNEN/SP, S?o Paulo, Brazil
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Abstract: | Perturbed gamma–gamma angular correlation technique was used to measure the magnetic hyperfine field at Gd sites in the intermetallic
compound GdAg using the 140La→140Ce nuclear probe. A major and well-defined magnetic interaction is observed at 140Ce substituting Gd sites in GdAg below 130 K, corresponding to a ferromagnetic ordering of Gd moments. The temperature dependence
of magnetic hyperfine field, however, shows a sharp deviation from an expected Brillouin-like behavior for temperatures below
75 K. This additional magnetic interaction is believed to result from the polarization of Ce spin moments induced by the magnetic
field from Gd atoms. |
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Keywords: | 140Ce magnetic hyperfine field PAC spectroscopy rare earth magnetism |
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