Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-04-26
Physics
Condensed Matter
Strongly Correlated Electrons
accepted for publication in J. Phys.: Condens. Matter
Scientific paper
10.1088/0953-8984/13/23/307
We present a detailed structural investigation via neutron diffraction of differently heat treated samples Fe2VAl and Fe2+xV1-xAl. Moreover, the magnetic behaviour of these materials is studied by means of mSR and Mossbauer-experiments. Our structural investigation indicates that quenched Fe2VAl, exhibiting the previously reported "Kondo insulating like" behaviour, is off-stoichiometric (6%) in its Al content. Slowly cooled Fe2VAl is structurally better ordered and stoichiometric, and the microscopic magnetic probes establish long range ferromagnetic order below TC = 13K, consistent with results from bulk experiments. The magnetic state can be modelled as being generated by diluted magnetic ions in a non-magnetic matrix. Quantitatively, the required number of magnetic ions is too large as to be explained by a model of Fe/V site exchange. We discuss the implications of our findings for the ground state properties of Fe2VAl, in particular with respect to the role of crystallographic disorder.
Baabe D.
Feyerherm Ralf
Klauss Hans-Henning
Litterst F. J.
Maksimov Ia. Ia.
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