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arXiv · 1312.2357

Spectroscopic study of the magnetic ground state of Nb$_{1-y}$Fe$_{2+y}$

Daniela Rauch·Mathias Kraken·F. Jochen Litterst·Stefan Süllow·Hubertus Luetkens·Manuel Brando·Tobias Förster·Jörg Sichelschmidt·Andreas Neubauer·Christian Pfleiderer·William J. Duncan·F. Malte Grosche
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Abstract

We have investigated single crystals and polycrystals from the series Nb$_{1-y}$Fe$_{2+y}$, $-0.004 \leq y \leq 0.018$ by electron spin resonance, muon spin relaxation and Mössbauer 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 ($\simeq 0.06 ~μ_B/{\rm Fe}$), Nb--rich and stoichiometric NbFe$_2$ display spin density wave order with small magnetic moment amplitudes of the order $\sim 0.001 - 0.01 ~μ_B/{\rm Fe}$. This provides microscopic evidence for a modulated magnetic state on the border of ferromagnetism in NbFe$_2$.

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Daniela Rauch, Mathias Kraken, F. Jochen Litterst, Stefan Süllow, Hubertus Luetkens, Manuel Brando, Tobias Förster, Jörg Sichelschmidt, Andreas Neubauer, Christian Pfleiderer, William J. Duncan, F. Malte Grosche. 2015-04-19. Spectroscopic study of the magnetic ground state of Nb$_{1-y}$Fe$_{2+y}$. https://doi.org/10.1103/physrevb.91.174404

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