Abstract
Amorphous Eu80Au20 has been investigated by means of Mossbauer spectroscopy and NMR at151Eu. A large electric field gradient (E F G) is detected. The E F G and isomer shift at Eu2 + ions reveal unusually large temperature dependences between 4.2 and 245 K. This feature is tentatively attributed to tunneling states, typical of amorphous materials. All the results are consistent with a strong structural short range order. The alloy orders asperomagnetically below Tc ≃ 85 K. The spontaneous magnetization, the hyper-fine field distribution and the reduced magnetization temperature dependence are consistently discussed in terms of distributions of moments directions and of exchange interactions.
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