Spectroscopic study of metallic magnetism in single-crystalline Nb1-yFe2+y

Rauch, D.; Kraken, M.; Litterst, F. J.; Süllow, S.; Luetkens, H.; Brando, M.; Förster, T.; Sichelschmidt, J.; Neubauer, A.; Pfleiderer, C.; Duncan, W. J.; Grosche, F. M.

doi:10.1103/PhysRevB.91.174404

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Spectroscopic study of metallic magnetism in single-crystalline Nb_1-yFe_2+y

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Brando, M.
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Förster, T.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sichelschmidt, J.
Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Rauch, D., Kraken, M., Litterst, F. J., Süllow, S., Luetkens, H., Brando, M., et al. (2015). Spectroscopic study of metallic magnetism in single-crystalline Nb_1-yFe_2+y. Physical Review B, 91(17): 174404, pp. 1-7. doi:10.1103/PhysRevB.91.174404.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0026-DC20-0

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.