Mössbauer spectroscopy on ferromagnetic Fe2 VAl
We present a detailed investigation of ferromagnetically ordered Fe2 VA1 by means of Mössbauer spectroscopy. For this compound it has been demonstrated previously that ferromagnetism is induced by heat treatment procedures. The ferromagnetic state is attributed to the presence of 4.2(8) % Fe ions carrying a magnetic moment, randomly distributed in the sample. It has been proposed that because of Fe/V sites exchanges a magnetic moment is carried by these Fe ions. Our Mössbauer data disprove this proposal, as it is inconsistent with the upper limit of 3 % Fe/V site exchanges in sc-Fe2 VAl determined in a previous neutron diffraction study. We discuss alternative scenarios to account for the observed behavior.
KeywordsHeusler compound Mössbauer spectroscopy Fe-Al alloys ferromagnetism shell model crystallographic disorder
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