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Abstract:
We have investigated single crystals and polycrystals from the series
Nb1-yFe2+y, -0.004 <= y <= 0.018, by electron spin resonance, muon spin
relaxation, and Mossbauer spectroscopy. Our data establish that at
lowest temperatures all samples exhibit bulk magnetic order. Slight Fe
excess induces low-moment ferromagnetism, consistent with bulk
magnetometry, while Nb-rich and stoichiometric NbFe2 display spin
density wave order with small magnetic moment amplitudes of order
similar to 0.001-0.01 mu(B)/Fe. This provides microscopic evidence for a
modulated magnetic state on the border of ferromagnetism in NbFe2.
