Mr
Franz X. Haslbeck
(Physics Department, Technical University of Munich, Germany; Institute for Advanced Study, Technical University of Munich, Germany)
Studying the prototypical ferromagnetic superconductor UGe$_2$ we demonstrate the potential of the newly developed longitudinal modulated intensity by zero effort (MIEZE) technique for the study of quantum matter. MIEZE is a novel neutron spectroscopy method with ultrahigh energy resolution of at least 1$\mu$eV at the RESEDA beamline at the Heinz Maier-Leibnitz Zentrum in Garching, Germany. Unlike other spin echo techniques, MIEZE encodes the resolution via a modulation of the neutron beam intensity and is insensitive to depolarization at the sample position and can even be combined with magnetic fields. Further, by performing the experiment in small angle neutron scattering (SANS) geometry, this simultaneously allowed us to resolve momentum transfers down to 0.015 Å$^{-1}$. In the case of UGe$_2$, we reveal purely longitudinal spin fluctuations with a dual nature arising from 5$f$ electrons that are hybridized with the conduction electrons. Local spin fluctuations are perfectly described by the Ising universality class in three dimensions, whereas itinerant spin fluctuations occur over length scales comparable to the superconducting coherence length, showing that MIEZE is able to spectroscopically disentangle the complex low-energy behavior characteristic of quantum materials.
[1] F. Haslbeck, et al., Phys. Rev. B 99 014429 (2019)
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Mr
Franz X. Haslbeck
(Physics Department, Technical University of Munich, Germany; Institute for Advanced Study, Technical University of Munich, Germany)
Dr
Steffen Säubert
(Physics Department, Technical University of Munich, Germany; Forschungs-Neutronenquelle Heinz-Maier Leibnitz (FRMII), Germany; Department of Physics, Colorado State University, Colorado, USA)
Mr
Marc Seifert
(Physics Department, Technical University of Munich, Germany; Forschungs-Neutronenquelle Heinz-Maier Leibnitz (FRMII), Germany)
Dr
Christian Franz
(Forschungs-Neutronenquelle Heinz-Maier Leibnitz (FRMII), Germany)
Dr
Michael Schulz
(Forschungs-Neutronenquelle Heinz-Maier Leibnitz (FRMII), Germany)
Dr
Andre Heinemann
(German Engineering Materials Science Centre at Heinz Maier-Leibnitz Zentrum Garching, Germany)
Dr
Thomas Keller
(Max-Planck-Institut für Festkörperforschung, Germany; Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz, Germany)
Dr
Joe D. Thompson
(Los Alamos National Laboratory, New Mexico, USA)
Dr
Eric D. Bauer
(Los Alamos National Laboratory, New Mexico, USA)
Prof.
Christian Pfleiderer
(Physics Department, Technical University of Munich, Germany )
Dr
Marc Janoschek
(Institute for Advanced Study, Technical University of Munich, Germany; Los Alamos National Laboratory, New Mexico, USA; Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, Villigen PSI, Switzerland)
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