Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.23: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
A microscopic study of Nb1−yFe2+y — •Daniela Rauch1, Mathias Kraken1, Jochen Litterst1, Stefan Süllow1, and F. Malte Grosche2 — 1Institute of Condensed Matter Physics, University of Technology Braunschweig, Braunschweig, Germany — 2Cavendish Laboratory, University of Cambridge, Cambridge, UK
The C14 laves phase system NbFe2 represents a very rare case of spin density wave order (SDW) in a 3d metal compound, which can be suppressed by slight changes to the stochiometry in Nb1−yFe2+y. In particular, stoichiometric NbFe2 exhibits a SDW order with a Néel temperature (TN) around 10K, while slight Fe-excess induces low-moment ferromagnetism, whereas a quantum critical point (QCP) is approached on the Nb-rich side of the composition range. Moreover, samples close to the QCP show non-Fermi liquid behavior ([1]-[4]).
Here we report a microscopic study of the alloying series Nb1−yFe2+y utilizing µSR and Mössbauer experiments. From our investigation using µSR we verify that all magnetic transitions are bulk transitions. Furthermore, combined with the µSR we present an analysis of the Mössbauer spectroscopy experiments and discuss the nature of the ground state magnetic phase in the light these studies.
[1] D. A. Tompsett et al. Phys. Rev B 82, 155137 (2010)
W. J. Duncan et al. Phys. Status Solidi B 247, 544 (2010)
D. Moroni-Klementowicz et al. Phys. Rev B 79, 224410 (2009)
M. Brando et al. Phys. Rev Letter 101, 026401 (2008).