Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Correlated Electrons: Quantum-Critical Phenomena - Experiment I
TT 35.10: Vortrag
Dienstag, 1. April 2014, 12:00–12:15, HSZ 204
Microscopic study about the magnetic ground state of C14 systems: Nb1−yFe2+y and Ta(Fe1−xVx)2 — •Daniela Rauch1, Mathias Kraken1, Jochen Litterst1, Hubertus Luetkens2, Manuel Brando3, Michael Baenitz3, William J Duncan4, Andreas Neubauer5, Christian Pfleiderer5, Stefan Süllow1, and F Malte Grosche4 — 1Institute of Condensed Matter Physics, TU Braunschweig, Braunschweig, Germany — 2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen, Switzerland — 3Max-Planck Institute for Chemical Physics of Solids, Dresden, Germany — 4Cavendish Laboratory, University of Cambridge, Cambridge, UK — 5Physik Department E21, TU München, Garching, Germany
A large number of C14 Laves systems exhibits a complex magnetic phase diagram with ferromagnetic critical fluctuations. In this context, Nb1−yFe2+y and Ta(Fe1−xVx)2 need to be discussed. NbFe2 has been proposed to represent a very rare case of spin density wave order (SDW), which can be suppressed by slight changes to the stoichiometry to be ferromagnetic. Here, we present for the first time µSR of Nb1−yFe2+y and identify SDW and ferromagnetic phases on a microscopic scale and establish them as bulk magnetic phases. Moreover, we present a combined µSR study with the analysis of Mößbauer spectroscopy experiments on Fe-rich Nb1−yFe2+y and discuss the nature of the ground state magnetic phases. In addition, Ta(Fe1−xVx)2 is of special interest because of ferromagnetic critical fluctuations, which evolved in the proximFor this reason, we report first Mößbauer experiments.