Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 38: Correlated Electrons: Spin Systems and Itinerant Magnets 1
TT 38.1: Talk
Thursday, March 29, 2012, 09:30–09:45, H 3010
Disentanglement of static and dynamic magnetism in itinerant AFe4X2 systems studied by Muon Spin Relaxation and Mössbauer Spectroscopy — •Til Goltz1, Nandang Mufti2, Christoph Geibel2, Johannes Spehling1, Hubertus Luetkens3, and Hans-Henning Klauss1 — 1Institute of Solid State Physics, TU Dresden, Germany — 2MPI for Chemical Physics of Solids, Dresden, Germany — 3Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen, Switzerland
The AFe4X2 (A=Y, Lu, Zr; X=Ge, Si) family of transition metal tetrels has shown to be a promising candidate for studying the change of the electronic ground state under chemical substitution [1]. Within the ZrFe4Si2-type structure (P42/mnm), the iron atoms are arranged in chains of edge-linked tetrahedra [2]. Their structure is prone for reduced dimensionality or frustration and is thus expected to lead to emergent phenomena near a quantum critical point.
In this talk, we give an overview of our recent experimental findings from Muon Spin Relaxation and Mössbauer Spectroscopy experiments for a variety of AFe4X2. We focus on the ZrFe4Si2 compound, where we observe electronic spin fluctuations already at 100 K whereas long-range magnetic order sets in only below 10 K.
N. Mufti, T.G. et al., DPG Spring Meeting 2011 (TT 49.11)
O.Ya. Oleksyn et al., Proc. 10th Int. Conf. Solid Compounds of Transition Elements, Münster, 1991